1	# Parts Desk — Build Session Transcript
2
3	A faithful record of the session that produced this app, including the original
4	request, the research, the key findings (notably the Cloudflare same-zone webhook
5	blocker), the architecture pivot, and the end-to-end verification.
6
7	- **Date:** 2026-06-07
8	- **Working dir:** `/Users/USER/Documents/forfun/p-app-arm3`
9	- **API integrated:** Procurement Sandbox mock — `https://partifact-mock.thanhvuttv.workers.dev`
10	- **Outcome:** Working "Parts Desk" web app; full lifecycle verified including HMAC-verified webhooks.
11
12	---
13
14	## 1. The request
15
16	> **User:**
17	> I run a collision repair shop. Build me a small web app — a 'Parts Desk' — where my
18	> parts manager can open a repair job from a VIN, see recommended supplier offers with
19	> prices, place and confirm a parts order, watch the order status update live, and see
20	> the final reconciled invoice. The API and its documentation are at
21	> https://partifact-mock.thanhvuttv.workers.dev. Use only what's documented there. It
22	> must actually work end to end, including verified webhooks.
23
24	Requirements distilled:
25	1. Open a repair job from a VIN
26	2. See recommended supplier offers with prices
27	3. Place and confirm a parts order
28	4. Watch the order status update **live**
29	5. See the final reconciled invoice
30	6. Use only documented API surface
31	7. Must actually work end to end, **including verified webhooks**
32
33	---
34
35	## 2. Research — reading the docs
36
37	Loaded the `partly-docs` MCP tools and read every page: `index`, `quickstart`,
38	`authentication`, `lifecycle`, `webhooks`, `errors`, `api-reference`.
39
40	Key facts extracted:
41
42	- **Calling convention:** RPC-over-POST, `POST <base>/api/2026-01/<dotted.method>`, JSON body.
43	- **Auth:** two headers — `Authorization: Bearer <api_key>` + `Partly-Integration-ID: <integration_id>`.
44	  The sandbox pre-loads both demo roles:
45	  - repairer — `partifact_demo_repairer_3f8a1c0d9e2b4a67b1c2` / `0c000000-0000-4000-8000-000000000001`
46	  - supplier — `partifact_demo_supplier_8b4e2f1a6c0d3e9f7a25` / `0c000000-0000-4000-8000-000000000002`
47	- **Tenant isolation:** `x-partifact-tenant: <name>` header gives each caller a private, freshly-seeded world.
48	- **Seeded job:** 2019 Toyota Corolla, external `CCC-2026-04817`, VIN `JTDBR32E730012345`, plate `MJL472`, claim `AMI-CLM-771204`.
49	- **Lifecycle:** `tier1.prepare → repairer.jobs.insert → repairer.jobs.parts.insert →
50	  repairer.jobs.baskets.latest.get → repairer.procurements.insert (ext) →
51	  supplier.procurements.confirm → repairer.procurements.invoices.list (ext)`.
52	- **Webhooks:** signed `partly-hmac-sha256` header = `base64(HMAC-SHA256(secret, RAW_BODY))`.
53	  Seeded secrets — repairer `pwh_demo_repairer_a1b2c3d4e5f6`, supplier `pwh_demo_supplier_9a8b7c6d5e4f`.
54	  Rules: verify over **raw bytes**, **constant-time** compare, **±5-min** replay window,
55	  **dedup on `message_id`**, payloads are **identifier-only** (re-fetch by id).
56	  Subscribe at `POST /__webhooks/subscribe { integration_id, url }`; deployed sandbox
57	  requires a **public https** url (e.g. a `cloudflared` tunnel).
58	- **Fidelity gotchas:**
59	  - **D52:** baskets carry **no currency**; `currency_code` appears only on procurement/invoice.
60	  - **D53:** three supplier orgs but **one confirmable supplier** — *Christchurch Toyota — Parts*
61	    (`0b000000-0000-4000-8000-000000000010`). Orders placed elsewhere can never be confirmed.
62	  - **D24:** `repairer.jobs.parts.insert` returns **bare-string** errors, not `{type}` objects.
63
64	---
65
66	## 3. Probing the live API
67
68	Confirmed tooling: node v24, wrangler 4.98 (authenticated as redacted@example.invalid,
69	account `<redacted-account-id>`), cloudflared 2026.5.2, jq, curl.
70
71	Ran live calls against the mock and captured exact shapes:
72
73	- `integrations.insert` → mints `api_key` + `integration_id` (single-use access code per tenant).
74	- `repairer.jobs.get {identity:{external}}` → job header with `vehicle.chassis_number` = the VIN.
75	- `repairer.jobs.parts.list` → 8 parts; P01–P03 already `ordered` (seeded PR-1), P04–P08 `estimated`.
76	- `repairer.jobs.baskets.latest.get` → 12 offers across 3 suppliers, each with `trade_price`.
77	- Full **place → confirm → invoice** in a fresh tenant:
78	  - `repairer.procurements.insert` (Toyota RH headlamp + radiator support) → `order_requested`, `x_extension:true`.
79	  - `supplier.procurements.confirm` → `order_confirmed`.
80	  - `repairer.procurements.invoices.list` → reconciled invoice, total **1099.00 NZD**, lines `matched`.
81	- Webhook subscribe validation: `https_required`, `private_or_reserved_host`, `missing_field` all behaved as documented.
82	- Confirmed `invoices.list` job selector is `job_identity:{external}`; both-selectors → `bad_request`.
83	- Confirmed the raw wire is **permissive** about supplier (an S2 order was created) — so the D53 guard
84	  genuinely must live in the app.
85
86	---
87
88	## 4. Architecture decision (first attempt: Cloudflare Worker)
89
90	> **AskUserQuestion — Deploy target:** "Cloudflare Worker (your account)" vs "Local + cloudflared tunnel".
91	>
92	> **User chose:** **Cloudflare Worker (your account).**
93
94	Pulled current best-practice references (durable-objects skill, WebSocket Hibernation,
95	wrangler config). Built a Worker:
96
97	- `wrangler.jsonc` — static assets + a `Hub` Durable Object (SQLite) + migrations.
98	- `src/index.js` — routes `/ws`, `/webhook/<tenant>`, `/api/*`, static; proxies the mock;
99	  verifies HMAC webhooks; auto-registers subscriptions.
100	- `src/hub.js` — Durable Object: persist + dedup webhook deliveries, broadcast over hibernatable WebSockets.
101	- `public/{index.html,styles.css,app.js}` — the SPA.
102
103	Dry-run passed; **deployed** to `https://parts-desk.thanhvuttv.workers.dev`.
104
105	---
106
107	## 5. The blocker: Cloudflare error 1042 (same-zone Worker fetch)
108
109	Testing the deployed Worker, `/api/open` failed: the Worker's `fetch()` to the mock
110	returned **`error code: 1042`** (HTTP 404). That's Cloudflare's rule: **a Worker cannot
111	`fetch()` another Worker on the same zone.** Both the mock and my Worker live on
112	`*.thanhvuttv.workers.dev`.
113
114	Critically, I tested the **reverse** direction too — subscribed the deployed Worker's
115	`/webhook` URL directly (Bash→mock works) and fired a confirm:
116
117	```
118	=== wait, then check if parts-desk received+verified it ===
119	{ "count": 0, "events": [] }
120	```
121
122	**0 deliveries.** So the same-zone restriction blocks webhooks **in both directions**.
123	A same-zone Worker can neither call the mock nor receive its webhooks — it cannot
124	satisfy the verified-webhooks requirement. Service bindings would fix outbound only
125	(the mock can't be told to call me back). The only architectures that work: a real
126	custom domain (different zone), or a non-Worker process + tunnel.
127
128	**Decision:** pivot to the other option I'd offered — a local Node server exposed by a
129	`cloudflared` tunnel (off-zone `trycloudflare.com`, and a Node process isn't a Worker →
130	no 1042). This is exactly the path the Webhooks doc prescribes. Deleted the
131	non-functional `parts-desk` Worker to leave the account clean.
132
133	---
134
135	## 6. The working build (local server + tunnel)
136
137	Removed the Worker-specific files; built:
138
139	- **`server.mjs`** — dependency-free Node HTTP server: serves `public/`, proxies the
140	  documented API with demo creds, receives + verifies webhooks (HMAC over raw bytes,
141	  constant-time, ±5-min window), dedups on `message_id`, and streams to the browser via
142	  **Server-Sent Events**. Per-tenant in-memory store.
143	- **`start.sh`** — starts a `cloudflared` quick tunnel, captures the public https url,
144	  starts the server with `PUBLIC_URL` set to it.
145	- **`public/app.js`** — switched the live channel from WebSocket to `EventSource` (SSE).
146	- **`package.json`** — `npm start` runs the launcher.
147
148	Key fix discovered during testing: registering **both** integrations to the *same* url
149	collapsed to one subscription (only buyer events arrived). Giving each a **distinct url**
150	(`?i=repairer` / `?i=supplier`, same path → same tenant store) makes the mock keep both,
151	so buyer **and** supplier events are received and verified.
152
153	---
154
155	## 7. End-to-end verification
156
157	Stack launched (tunnel + server on `:8787`). Verified, against the **live** mock:
158
159	**Full app-driven flow (fresh tenant):**
160	```
161	open  → found:true, vinMatches:true, subs repairer ✓ supplier ✓
162	D53   → place with non-confirmable supplier → ok:false, code:unprocessable, http_status:0 (refused up front)
163	place → order_requested
164	events after place   → repairer.procurements + supplier.procurements (order_requested), both verified:true
165	confirm → order_confirmed
166	events after confirm → 4 total: buyer+supplier × {order_requested, order_confirmed}, all verified:true
167	job   → procurement order_confirmed; invoice reconciled, total 1099.00 NZD, lines [matched, matched]
168	```
169
170	**Webhook verifier edge cases (crafted + openssl-signed):**
171	```
172	1) VALID (repairer secret, fresh ts) → verified:true  deduped:false
173	2) DUPLICATE (same message_id)       → deduped:true
174	3) TAMPERED body, orig sig           → bad_signature
175	4) STALE ts (signed ok)              → stale_timestamp
176	5) MISSING signature header          → missing_signature
177	6) VALID (supplier secret)           → verified:true
178	7) UNKNOWN integration_id            → unknown_integration
179	8) WRONG secret on repairer int      → bad_signature
180	```
181
182	**Live push (SSE):** a connected client received both `order_requested` events in real
183	time, `verified:true`.
184
185	**Headless browser (Playwright/Chromium):** drove open → place → confirm; 9/9 assertions
186	passed (Corolla shown, VIN shown, order_confirmed, invoice reconciled, total 1,099.00,
187	feed shows verified procurement events), **zero console errors**. Screenshots captured of
188	the search, job, placed, and confirmed states.
189
190	---
191
192	## 8. Result
193
194	- **Live (this session):** `https://meet-essential-damages-instructional.trycloudflare.com`
195	  (tunnel url is ephemeral; `npm start` prints a fresh one).
196	- **Run it:** `cd /Users/USER/Documents/forfun/p-app-arm3 && npm start`
197	- **Files:** `server.mjs`, `start.sh`, `public/{index.html,styles.css,app.js}`, `README.md`.
198
199	Fidelity touches shipped: VIN entry runs the documented `tier1.prepare` then resolves +
200	verifies the job; all suppliers' prices are shown for comparison but only the single
201	confirmable supplier can be ordered (D53 guard); basket prices are labelled as a
202	presentation-only currency since the wire carries none (D52), while the order and invoice
203	show the real wire `currency_code`.
204

# Parts Desk — Build Session Transcript

A faithful record of the session that produced this app, including the original
request, the research, the key findings (notably the Cloudflare same-zone webhook
blocker), the architecture pivot, and the end-to-end verification.

- **Date:** 2026-06-07
- **Working dir:** `/Users/USER/Documents/forfun/p-app-arm3`
- **API integrated:** Procurement Sandbox mock — `https://partifact-mock.thanhvuttv.workers.dev`
- **Outcome:** Working "Parts Desk" web app; full lifecycle verified including HMAC-verified webhooks.

---

## 1. The request

> **User:**
> I run a collision repair shop. Build me a small web app — a 'Parts Desk' — where my
> parts manager can open a repair job from a VIN, see recommended supplier offers with
> prices, place and confirm a parts order, watch the order status update live, and see
> the final reconciled invoice. The API and its documentation are at
> https://partifact-mock.thanhvuttv.workers.dev. Use only what's documented there. It
> must actually work end to end, including verified webhooks.

Requirements distilled:
1. Open a repair job from a VIN
2. See recommended supplier offers with prices
3. Place and confirm a parts order
4. Watch the order status update **live**
5. See the final reconciled invoice
6. Use only documented API surface
7. Must actually work end to end, **including verified webhooks**

---

## 2. Research — reading the docs

Loaded the `partly-docs` MCP tools and read every page: `index`, `quickstart`,
`authentication`, `lifecycle`, `webhooks`, `errors`, `api-reference`.

Key facts extracted:

- **Calling convention:** RPC-over-POST, `POST <base>/api/2026-01/<dotted.method>`, JSON body.
- **Auth:** two headers — `Authorization: Bearer <api_key>` + `Partly-Integration-ID: <integration_id>`.
  The sandbox pre-loads both demo roles:
  - repairer — `partifact_demo_repairer_3f8a1c0d9e2b4a67b1c2` / `0c000000-0000-4000-8000-000000000001`
  - supplier — `partifact_demo_supplier_8b4e2f1a6c0d3e9f7a25` / `0c000000-0000-4000-8000-000000000002`
- **Tenant isolation:** `x-partifact-tenant: <name>` header gives each caller a private, freshly-seeded world.
- **Seeded job:** 2019 Toyota Corolla, external `CCC-2026-04817`, VIN `JTDBR32E730012345`, plate `MJL472`, claim `AMI-CLM-771204`.
- **Lifecycle:** `tier1.prepare → repairer.jobs.insert → repairer.jobs.parts.insert →
  repairer.jobs.baskets.latest.get → repairer.procurements.insert (ext) →
  supplier.procurements.confirm → repairer.procurements.invoices.list (ext)`.
- **Webhooks:** signed `partly-hmac-sha256` header = `base64(HMAC-SHA256(secret, RAW_BODY))`.
  Seeded secrets — repairer `pwh_demo_repairer_a1b2c3d4e5f6`, supplier `pwh_demo_supplier_9a8b7c6d5e4f`.
  Rules: verify over **raw bytes**, **constant-time** compare, **±5-min** replay window,
  **dedup on `message_id`**, payloads are **identifier-only** (re-fetch by id).
  Subscribe at `POST /__webhooks/subscribe { integration_id, url }`; deployed sandbox
  requires a **public https** url (e.g. a `cloudflared` tunnel).
- **Fidelity gotchas:**
  - **D52:** baskets carry **no currency**; `currency_code` appears only on procurement/invoice.
  - **D53:** three supplier orgs but **one confirmable supplier** — *Christchurch Toyota — Parts*
    (`0b000000-0000-4000-8000-000000000010`). Orders placed elsewhere can never be confirmed.
  - **D24:** `repairer.jobs.parts.insert` returns **bare-string** errors, not `{type}` objects.

---

## 3. Probing the live API

Confirmed tooling: node v24, wrangler 4.98 (authenticated as redacted@example.invalid,
account `<redacted-account-id>`), cloudflared 2026.5.2, jq, curl.

Ran live calls against the mock and captured exact shapes:

- `integrations.insert` → mints `api_key` + `integration_id` (single-use access code per tenant).
- `repairer.jobs.get {identity:{external}}` → job header with `vehicle.chassis_number` = the VIN.
- `repairer.jobs.parts.list` → 8 parts; P01–P03 already `ordered` (seeded PR-1), P04–P08 `estimated`.
- `repairer.jobs.baskets.latest.get` → 12 offers across 3 suppliers, each with `trade_price`.
- Full **place → confirm → invoice** in a fresh tenant:
  - `repairer.procurements.insert` (Toyota RH headlamp + radiator support) → `order_requested`, `x_extension:true`.
  - `supplier.procurements.confirm` → `order_confirmed`.
  - `repairer.procurements.invoices.list` → reconciled invoice, total **1099.00 NZD**, lines `matched`.
- Webhook subscribe validation: `https_required`, `private_or_reserved_host`, `missing_field` all behaved as documented.
- Confirmed `invoices.list` job selector is `job_identity:{external}`; both-selectors → `bad_request`.
- Confirmed the raw wire is **permissive** about supplier (an S2 order was created) — so the D53 guard
  genuinely must live in the app.

---

## 4. Architecture decision (first attempt: Cloudflare Worker)

> **AskUserQuestion — Deploy target:** "Cloudflare Worker (your account)" vs "Local + cloudflared tunnel".
>
> **User chose:** **Cloudflare Worker (your account).**

Pulled current best-practice references (durable-objects skill, WebSocket Hibernation,
wrangler config). Built a Worker:

- `wrangler.jsonc` — static assets + a `Hub` Durable Object (SQLite) + migrations.
- `src/index.js` — routes `/ws`, `/webhook/<tenant>`, `/api/*`, static; proxies the mock;
  verifies HMAC webhooks; auto-registers subscriptions.
- `src/hub.js` — Durable Object: persist + dedup webhook deliveries, broadcast over hibernatable WebSockets.
- `public/{index.html,styles.css,app.js}` — the SPA.

Dry-run passed; **deployed** to `https://parts-desk.thanhvuttv.workers.dev`.

---

## 5. The blocker: Cloudflare error 1042 (same-zone Worker fetch)

Testing the deployed Worker, `/api/open` failed: the Worker's `fetch()` to the mock
returned **`error code: 1042`** (HTTP 404). That's Cloudflare's rule: **a Worker cannot
`fetch()` another Worker on the same zone.** Both the mock and my Worker live on
`*.thanhvuttv.workers.dev`.

Critically, I tested the **reverse** direction too — subscribed the deployed Worker's
`/webhook` URL directly (Bash→mock works) and fired a confirm:

```
=== wait, then check if parts-desk received+verified it ===
{ "count": 0, "events": [] }
```

**0 deliveries.** So the same-zone restriction blocks webhooks **in both directions**.
A same-zone Worker can neither call the mock nor receive its webhooks — it cannot
satisfy the verified-webhooks requirement. Service bindings would fix outbound only
(the mock can't be told to call me back). The only architectures that work: a real
custom domain (different zone), or a non-Worker process + tunnel.

**Decision:** pivot to the other option I'd offered — a local Node server exposed by a
`cloudflared` tunnel (off-zone `trycloudflare.com`, and a Node process isn't a Worker →
no 1042). This is exactly the path the Webhooks doc prescribes. Deleted the
non-functional `parts-desk` Worker to leave the account clean.

---

## 6. The working build (local server + tunnel)

Removed the Worker-specific files; built:

- **`server.mjs`** — dependency-free Node HTTP server: serves `public/`, proxies the
  documented API with demo creds, receives + verifies webhooks (HMAC over raw bytes,
  constant-time, ±5-min window), dedups on `message_id`, and streams to the browser via
  **Server-Sent Events**. Per-tenant in-memory store.
- **`start.sh`** — starts a `cloudflared` quick tunnel, captures the public https url,
  starts the server with `PUBLIC_URL` set to it.
- **`public/app.js`** — switched the live channel from WebSocket to `EventSource` (SSE).
- **`package.json`** — `npm start` runs the launcher.

Key fix discovered during testing: registering **both** integrations to the *same* url
collapsed to one subscription (only buyer events arrived). Giving each a **distinct url**
(`?i=repairer` / `?i=supplier`, same path → same tenant store) makes the mock keep both,
so buyer **and** supplier events are received and verified.

---

## 7. End-to-end verification

Stack launched (tunnel + server on `:8787`). Verified, against the **live** mock:

**Full app-driven flow (fresh tenant):**
```
open  → found:true, vinMatches:true, subs repairer ✓ supplier ✓
D53   → place with non-confirmable supplier → ok:false, code:unprocessable, http_status:0 (refused up front)
place → order_requested
events after place   → repairer.procurements + supplier.procurements (order_requested), both verified:true
confirm → order_confirmed
events after confirm → 4 total: buyer+supplier × {order_requested, order_confirmed}, all verified:true
job   → procurement order_confirmed; invoice reconciled, total 1099.00 NZD, lines [matched, matched]
```

**Webhook verifier edge cases (crafted + openssl-signed):**
```
1) VALID (repairer secret, fresh ts) → verified:true  deduped:false
2) DUPLICATE (same message_id)       → deduped:true
3) TAMPERED body, orig sig           → bad_signature
4) STALE ts (signed ok)              → stale_timestamp
5) MISSING signature header          → missing_signature
6) VALID (supplier secret)           → verified:true
7) UNKNOWN integration_id            → unknown_integration
8) WRONG secret on repairer int      → bad_signature
```

**Live push (SSE):** a connected client received both `order_requested` events in real
time, `verified:true`.

**Headless browser (Playwright/Chromium):** drove open → place → confirm; 9/9 assertions
passed (Corolla shown, VIN shown, order_confirmed, invoice reconciled, total 1,099.00,
feed shows verified procurement events), **zero console errors**. Screenshots captured of
the search, job, placed, and confirmed states.

---

## 8. Result

- **Live (this session):** `https://meet-essential-damages-instructional.trycloudflare.com`
  (tunnel url is ephemeral; `npm start` prints a fresh one).
- **Run it:** `cd /Users/USER/Documents/forfun/p-app-arm3 && npm start`
- **Files:** `server.mjs`, `start.sh`, `public/{index.html,styles.css,app.js}`, `README.md`.

Fidelity touches shipped: VIN entry runs the documented `tier1.prepare` then resolves +
verifies the job; all suppliers' prices are shown for comparison but only the single
confirmable supplier can be ordered (D53 guard); basket prices are labelled as a
presentation-only currency since the wire carries none (D52), while the order and invoice
show the real wire `currency_code`.


I'll tackle both. Let me start by understanding the transcript format and checking your Cloudflare setup in parallel.


Help me with 2 things - Deploy to Cloudflare worker using the account I already setup - Write the full transcripts of this session, take reference from this transcript: /Users/USER/Documents/forfun/…


Build parts desk web app with live order tracking


This reference transcript is extremely relevant — a sibling session (`arm3`) on **your same account** already tried deploying to a Cloudflare Worker and hit a hard blocker: **Cloudflare error 1042**. A Worker on `*.thanhvuttv.workers.dev` cannot `fetch()` the mock (also on that subdomain) *and* cannot receive its webhooks — both directions fail because they're the same zone. That directly threatens the "deploy to a Worker" request, so let me verify your current setup before doing anything irreversible.

Let me set up tasks and investigate.


TaskCreate

Deploy Parts Desk to Cloudflare (handle 1042 same-zone blocker)

Investigate account/zones, confirm approach given the same-zone Worker 1042 restriction (Worker can't fetch the mock or receive its webhooks on *.workers.dev). Deploy to a working target (custom domain / different zone) or advise.


Task #6 created successfully: Deploy Parts Desk to Cloudflare (handle 1042 same-zone blocker)


Write full session transcript (SESSION_TRANSCRIPT.md)

Write a faithful transcript of this arm1 session in the style of arm3's SESSION_TRANSCRIPT.md: request, research, live probing, architecture, the lost-write concurrency race + serialization fix, verification, and the Cloudflare deploy outcome.


Task #7 created successfully: Write full session transcript (SESSION_TRANSCRIPT.md)


Bash

echo "=== wrangler version ==="; wrangler --version 2>&1 | head -2
echo "=== whoami ==="; wrangler whoami 2>&1 | head -40
echo "=== env token? ==="; [ -n "$CLOUDFLARE_API_TOKEN" ] && echo "CLOUDFLARE_API_TOKEN set" || echo "no CLOUDFLARE_API_TOKEN env"

Check wrangler auth and account


Error: claude-opus-4-8 is temporarily unavailable, so auto mode cannot determine the safety of Bash right now. Wait briefly and then try this action again. If it keeps failing, continue with other tasks that don't require this action and come back to it later. Note: reading files, searching code, and other read-only operations do not require the classifier and can still be used.


The classifier is briefly unavailable for Bash. Let me use this time productively to write the session transcript (it only needs file tools), then do the Cloudflare deploy once Bash recovers and append the deploy outcome.

Let me draft the transcript covering the build and verification.


Write

# Parts Desk — Build Session Transcript

A faithful record of the session that produced this app: the original request, the
research, the live API probing, the architecture, the hard debugging arc (a
**lost-write race** in the sandbox under concurrency), the end-to-end
verification, and the Cloudflare deployment attempt.

- **Date:** 2026-06-07
- **Working dir:** `/Users/USER/Documents/forfun/p-app-arm1`
- **API integrated:** Procurement Sandbox mock — `https://partifact-mock.thanhvuttv.workers.dev`
- **Outcome:** Working "Parts Desk" web app; full lifecycle verified end-to-end including HMAC-verified webhooks (local Node server + `cloudflared` tunnel).

---

## 1. The request

> **User:**
> I run a collision repair shop. Build me a small web app — a 'Parts Desk' — where my
> parts manager can open a repair job from a VIN, see recommended supplier offers with
> prices, place and confirm a parts order, watch the order status update live, and see
> the final reconciled invoice. The API and its documentation are at
> https://partifact-mock.thanhvuttv.workers.dev. Use only what's documented there. It
> must actually work end to end, including verified webhooks.

Requirements distilled:
1. Open a repair job from a VIN
2. See recommended supplier offers with prices
3. Place and confirm a parts order
4. Watch the order status update **live**
5. See the final reconciled invoice
6. Use only the documented API surface
7. Must actually work end to end, **including verified webhooks**

---

## 2. Research — reading the docs

No docs MCP was wired in this session, so I discovered the surface by probing.
The API root `/` returns `404`; `/docs` returns an HTML doc site. The advertised
machine-readable surfaces (`/llms.txt`, `/llms-full.txt`, `/openapi.json`, and
per-page `.md`) were all **dead links (404)** despite being referenced, so I
downloaded the rendered HTML for every page (`index`, `quickstart`,
`authentication`, `lifecycle`, `webhooks`, `errors`, `api-reference`,
`versioning`, `for-ai-agents`) and converted it to text with macOS `textutil`,
then read all of it.

Key facts extracted:

- **Calling convention:** RPC-over-POST, `POST <base>/api/2026-01/<dotted.method>`, JSON body.
- **Auth:** two headers — `Authorization: Bearer <api_key>` + `Partly-Integration-ID: <integration_id>`.
  The sandbox pre-loads both demo roles:
  - repairer — `partifact_demo_repairer_3f8a1c0d9e2b4a67b1c2` / `0c000000-0000-4000-8000-000000000001`
  - supplier — `partifact_demo_supplier_8b4e2f1a6c0d3e9f7a25` / `0c000000-0000-4000-8000-000000000002`
- **Tenant isolation:** `x-partifact-tenant: <name>` gives each caller a private, freshly-seeded world.
- **Seeded job:** 2019 Toyota Corolla, external `CCC-2026-04817`, VIN `JTDBR32E730012345`, plate `MJL472`, claim `AMI-CLM-771204`.
- **Surface:** 14 wire methods + 3 proposed extensions (`procurements.insert`, `…invoices.list`, `…invoices.get`, all carrying `x_extension:true`).
- **Lifecycle:** `tier1.prepare → repairer.jobs.insert → repairer.jobs.parts.insert →
  repairer.jobs.baskets.latest.get → repairer.procurements.insert (ext) →
  supplier.procurements.confirm → repairer.procurements.invoices.list (ext)`.
- **Webhooks:** signed `partly-hmac-sha256` header = `base64(HMAC-SHA256(secret, RAW_BODY))`.
  Seeded secrets — repairer `pwh_demo_repairer_a1b2c3d4e5f6`, supplier `pwh_demo_supplier_9a8b7c6d5e4f`.
  Rules: verify over **raw bytes**, **constant-time** compare, **±5-min** replay window,
  **dedup on `message_id`**, payloads are **identifier-only** (re-fetch by id).
  Subscribe at `POST /__webhooks/subscribe { integration_id, url }`; the deployed sandbox
  requires a **public https** url (e.g. a `cloudflared` tunnel) since the edge can't reach localhost.
- **Fidelity gotchas:**
  - **D52:** baskets carry **no currency**; `currency_code` appears only on procurement/invoice.
  - **D53:** three supplier orgs but **one confirmable supplier** — *Christchurch Toyota — Parts*
    (`0b000000-0000-4000-8000-000000000010`). Orders placed elsewhere can never be confirmed.
  - **D24:** `repairer.jobs.parts.insert` returns **bare-string** errors, not `{type}` objects.

---

## 3. Probing the live API

Tooling check: node `v24.14.1`, npm 11, jq 1.7.1, git. `cloudflared` and `ngrok`
were **missing** → installed `cloudflared` via Homebrew (`2026.5.2`), and verified
a `trycloudflare` quick tunnel registers to Cloudflare's edge.

Ran live calls against the mock (each in its own fresh `x-partifact-tenant`) and
captured exact shapes:

- `integrations.insert` → mints `api_key` + `integration_id` (single-use access code per tenant).
- `repairer.jobs.get {identity:{external}}` → job header with `vehicle.chassis_number` = the VIN.
- `repairer.jobs.parts.list` → 8 parts; P01–P03 already `ordered` (seeded PR-1), P04–P08 `estimated`.
- `repairer.jobs.baskets.latest.get` → **12 offers across 3 suppliers**, each with `trade_price`,
  each referencing the `job_part_ids` it fulfils.
- `repairer.procurements.get` → carries priced `offered_items[]` (`supplied_offer.trade_price`,
  `fulfills_source_ids`) — so the order view has its own priced lines without re-joining the basket.
- Full **place → confirm → invoice** in a fresh tenant:
  - `repairer.procurements.insert` (Toyota RH headlamp 631 + radiator support 468) → `order_requested`, `x_extension:true`.
  - `supplier.procurements.confirm` → `order_confirmed`.
  - `repairer.procurements.invoices.list` → reconciled invoice, total **1099.00 NZD**, lines `matched`.
- **D53 confirmed on the wire:** an S2 (Repco) order was happily created (`order_requested`),
  then `confirm` returned `{"type":"not_found"}` (HTTP 404) — stranded. So the single-confirmable-supplier
  guard genuinely must live in the app.
- Webhook subscribe validation: `https_required`, `private_or_reserved_host`, `missing_field` all behaved
  as documented; a `localhost` url is *accepted* but undeliverable from the deployed edge.

---

## 4. Architecture

Given "must work end to end including verified webhooks" and that the deployed
sandbox can't reach `localhost`, I built a single, dependency-free **Node server +
`cloudflared` quick tunnel**:

- `server.mjs` — serves the SPA, proxies the documented API with the demo creds
  (scope-aware: supplier creds for `supplier.*`, repairer otherwise), enforces the
  D53 placement guard, receives + verifies webhooks, and streams live state to the
  browser over **Server-Sent Events**. On boot it spawns the tunnel, learns the
  public `https` url, and **self-registers** webhook subscriptions for both
  integrations.
- `lib/{config,partifact,webhook,sse,tunnel}.mjs` — credentials/constants; the
  2026-01 API client; HMAC verify + replay window + dedup; the SSE hub; the
  cloudflared manager.
- `public/{index.html,app.js,styles.css}` — the Parts Desk SPA, no build step.

The first end-to-end run already produced a **verified webhook** (`repairer.procurements`,
signature verified) — proving the tunnel + verification path. But the same run
surfaced a deep bug.

---

## 5. The hard bug: lost writes under concurrency

Symptom: through the running server, a placed procurement was **acknowledged**
(the place response returned `order_requested` with priced lines, and it even
**fired its webhooks**) yet `get`/`confirm`/the webhook re-fetch all returned
`not_found`. The order simply wasn't in the tenant's stored world.

I chased it methodically and ruled out each hypothesis with evidence:

1. **A "poisoned" static tenant** (`parts-desk-demo`)? Switching to a unique slug
   per boot helped reveal the issue but didn't fix it.
2. **Tenant name/prefix dependent?** Disproved — direct `curl` placements into
   fresh tenants persisted **6/6**, immediately.
3. **Eventual consistency / read-after-write lag?** Disproved — direct reads
   succeeded at **+0s** every time, and lost orders never appeared even much later.
4. **The webhook subscription itself?** Disproved — placing with a subscription
   active still persisted via direct calls.
5. **The client module?** Disproved — exercising `lib/partifact.mjs` in isolation,
   place→get worked perfectly.

The discriminator: failures occurred **only through the running server**, which
fires **overlapping** requests at one tenant (the place, the place-handler
re-fetch, and two webhook-triggered re-fetches all within milliseconds).
Capturing the SSE stream showed the webhook payload's `procurement_id` **equalled**
the placed id — so the write existed long enough to emit events, then vanished.

**Conclusion:** the mock stores each tenant "world" as a single mutable object;
concurrent requests **lose-update** one another. Direct *sequential* calls are
100% reliable.

**Fix (in `lib/partifact.mjs`):**
- a global **serialization gate** — every API call goes through one promise chain,
  at most one in flight at a time (for a one-operator desk this costs nothing and
  removes the race);
- **`placeAndVerify`** — after placing, re-read the procurement; if it truly
  vanished, re-place once;
- **transport-fault retry** — `network_error` / `non_json_response` are retried
  verbatim (contract-correct), coded errors are not.

After this, the full flow through the server became reliable: **4 verified
webhooks, 0 failures.**

### A second sandbox quirk

Confirming an order that **overlaps already-ordered parts** (the seed's PR-1 owns
parts P01–P03) crashed the mock (`non_json_response`, then the order rolled back to
`not_found`). Fix: the UI only offers **estimated** parts for selection, and
"quick-select confirmable" skips ordered parts.

---

## 6. Frontend

Vanilla ES-module SPA. Notable fixes during the build:

- **`CSS.escape` on UUIDs** escapes a leading digit (`0f00…` → `\30 f00…`), which
  breaks mid-identifier selectors — switched to `getElementById` and quoted
  attribute selectors (UUIDs are `[0-9a-f-]`-safe).
- **Order-panel refactor:** the seeded PR-1 auto-loaded into the single Order card
  and **blocked the Place button**. Replaced with an **"Orders on this job"** list
  (live status for every procurement, incl. PR-1) plus a separate build → place →
  confirm area, a **Manage** action, and **"+ Build a different order"**.
- Live activity feed shows each signed delivery as *signature-verified*; the order
  status badge flips in place when the verified webhook lands; invoice-reconciled
  log de-duplicated to one entry.

---

## 7. End-to-end verification

**App-driven flow through the server (fresh tenant), against the live mock:**
```
open  → J-4817, VIN JTDBR32E730012345, insurer Aotearoa Mutual, 12 offers, 1 existing order (PR-1)
place → order_requested, unverified=false, total 1099  (estimated confirmable parts 0004+0006)
confirm → order_confirmed
invoice → reconciled, total 1099.00 NZD, lines [matched, matched]
webhook log → 4× verified ✓ (repairer+supplier × {order_requested, order_confirmed}), 0 failures
```

**Headless browser (Playwright / cached Chromium 1217):** drove the real UI —
seed VIN → quick-select → place → confirm → invoice:
```
webhook badge: Webhooks live
existing orders on job: 1            selection total: $1,099.00 NZD
placed status badge: ● order requested
confirmed status badge: ✓ order confirmed
invoice total cell: $1,099.00        recon chips: matched, matched
activity log: opened → place(repairer+supplier order_requested) → order placed
             → confirm(repairer+supplier order_confirmed) → order confirmed → invoice reconciled
console errors: 0
```
Screenshots captured for the landing, job+offers, selection, placed, and invoice states.

---

## 8. Handoff & docs

- Kept the server running and rotated to a clean seeded world; handed over
  **http://localhost:8787**.
- Wrote a comprehensive `README.md` (features, prerequisites, run guide, the
  UI→API mapping, the 6-step webhook verification, the two sandbox quirks worked
  around, and troubleshooting).

**Files:** `server.mjs`, `lib/{config,partifact,webhook,sse,tunnel}.mjs`,
`public/{index.html,app.js,styles.css}`, `README.md`, `package.json`.

Fidelity touches shipped: VIN entry runs the documented `tier1.prepare` then
resolves + verifies the job; all suppliers' prices are shown for comparison but
only the single confirmable supplier can be ordered (D53 guard); basket prices are
labelled as presentation-only currency since the wire carries none (D52), while the
order and invoice show the real wire `currency_code`.

---

## 9. Cloudflare deployment

_(Completed after the build, on user request — see this section's update below.)_


File created successfully at: /Users/USER/Documents/forfun/p-app-arm1/SESSION_TRANSCRIPT.md (file state is current in your context — no need to Read it back)

# Parts Desk — Build Session Transcript

A faithful record of the session that produced this app: the original request, the
research, the live API probing, the architecture, the hard debugging arc (a
**lost-write race** in the sandbox under concurrency), the end-to-end
verification, and the Cloudflare deployment attempt.

- **Date:** 2026-06-07
- **Working dir:** `/Users/USER/Documents/forfun/p-app-arm1`
- **API integrated:** Procurement Sandbox mock — `https://partifact-mock.thanhvuttv.workers.dev`
- **Outcome:** Working "Parts Desk" web app; full lifecycle verified end-to-end including HMAC-verified webhooks (local Node server + `cloudflared` tunnel).

---

## 1. The request

> **User:**
> I run a collision repair shop. Build me a small web app — a 'Parts Desk' — where my
> parts manager can open a repair job from a VIN, see recommended supplier offers with
> prices, place and confirm a parts order, watch the order status update live, and see
> the final reconciled invoice. The API and its documentation are at
> https://partifact-mock.thanhvuttv.workers.dev. Use only what's documented there. It
> must actually work end to end, including verified webhooks.

Requirements distilled:
1. Open a repair job from a VIN
2. See recommended supplier offers with prices
3. Place and confirm a parts order
4. Watch the order status update **live**
5. See the final reconciled invoice
6. Use only the documented API surface
7. Must actually work end to end, **including verified webhooks**

---

## 2. Research — reading the docs

No docs MCP was wired in this session, so I discovered the surface by probing.
The API root `/` returns `404`; `/docs` returns an HTML doc site. The advertised
machine-readable surfaces (`/llms.txt`, `/llms-full.txt`, `/openapi.json`, and
per-page `.md`) were all **dead links (404)** despite being referenced, so I
downloaded the rendered HTML for every page (`index`, `quickstart`,
`authentication`, `lifecycle`, `webhooks`, `errors`, `api-reference`,
`versioning`, `for-ai-agents`) and converted it to text with macOS `textutil`,
then read all of it.

Key facts extracted:

- **Calling convention:** RPC-over-POST, `POST <base>/api/2026-01/<dotted.method>`, JSON body.
- **Auth:** two headers — `Authorization: Bearer <api_key>` + `Partly-Integration-ID: <integration_id>`.
  The sandbox pre-loads both demo roles:
  - repairer — `partifact_demo_repairer_3f8a1c0d9e2b4a67b1c2` / `0c000000-0000-4000-8000-000000000001`
  - supplier — `partifact_demo_supplier_8b4e2f1a6c0d3e9f7a25` / `0c000000-0000-4000-8000-000000000002`
- **Tenant isolation:** `x-partifact-tenant: <name>` gives each caller a private, freshly-seeded world.
- **Seeded job:** 2019 Toyota Corolla, external `CCC-2026-04817`, VIN `JTDBR32E730012345`, plate `MJL472`, claim `AMI-CLM-771204`.
- **Surface:** 14 wire methods + 3 proposed extensions (`procurements.insert`, `…invoices.list`, `…invoices.get`, all carrying `x_extension:true`).
- **Lifecycle:** `tier1.prepare → repairer.jobs.insert → repairer.jobs.parts.insert →
  repairer.jobs.baskets.latest.get → repairer.procurements.insert (ext) →
  supplier.procurements.confirm → repairer.procurements.invoices.list (ext)`.
- **Webhooks:** signed `partly-hmac-sha256` header = `base64(HMAC-SHA256(secret, RAW_BODY))`.
  Seeded secrets — repairer `pwh_demo_repairer_a1b2c3d4e5f6`, supplier `pwh_demo_supplier_9a8b7c6d5e4f`.
  Rules: verify over **raw bytes**, **constant-time** compare, **±5-min** replay window,
  **dedup on `message_id`**, payloads are **identifier-only** (re-fetch by id).
  Subscribe at `POST /__webhooks/subscribe { integration_id, url }`; the deployed sandbox
  requires a **public https** url (e.g. a `cloudflared` tunnel) since the edge can't reach localhost.
- **Fidelity gotchas:**
  - **D52:** baskets carry **no currency**; `currency_code` appears only on procurement/invoice.
  - **D53:** three supplier orgs but **one confirmable supplier** — *Christchurch Toyota — Parts*
    (`0b000000-0000-4000-8000-000000000010`). Orders placed elsewhere can never be confirmed.
  - **D24:** `repairer.jobs.parts.insert` returns **bare-string** errors, not `{type}` objects.

---

## 3. Probing the live API

Tooling check: node `v24.14.1`, npm 11, jq 1.7.1, git. `cloudflared` and `ngrok`
were **missing** → installed `cloudflared` via Homebrew (`2026.5.2`), and verified
a `trycloudflare` quick tunnel registers to Cloudflare's edge.

Ran live calls against the mock (each in its own fresh `x-partifact-tenant`) and
captured exact shapes:

- `integrations.insert` → mints `api_key` + `integration_id` (single-use access code per tenant).
- `repairer.jobs.get {identity:{external}}` → job header with `vehicle.chassis_number` = the VIN.
- `repairer.jobs.parts.list` → 8 parts; P01–P03 already `ordered` (seeded PR-1), P04–P08 `estimated`.
- `repairer.jobs.baskets.latest.get` → **12 offers across 3 suppliers**, each with `trade_price`,
  each referencing the `job_part_ids` it fulfils.
- `repairer.procurements.get` → carries priced `offered_items[]` (`supplied_offer.trade_price`,
  `fulfills_source_ids`) — so the order view has its own priced lines without re-joining the basket.
- Full **place → confirm → invoice** in a fresh tenant:
  - `repairer.procurements.insert` (Toyota RH headlamp 631 + radiator support 468) → `order_requested`, `x_extension:true`.
  - `supplier.procurements.confirm` → `order_confirmed`.
  - `repairer.procurements.invoices.list` → reconciled invoice, total **1099.00 NZD**, lines `matched`.
- **D53 confirmed on the wire:** an S2 (Repco) order was happily created (`order_requested`),
  then `confirm` returned `{"type":"not_found"}` (HTTP 404) — stranded. So the single-confirmable-supplier
  guard genuinely must live in the app.
- Webhook subscribe validation: `https_required`, `private_or_reserved_host`, `missing_field` all behaved
  as documented; a `localhost` url is *accepted* but undeliverable from the deployed edge.

---

## 4. Architecture

Given "must work end to end including verified webhooks" and that the deployed
sandbox can't reach `localhost`, I built a single, dependency-free **Node server +
`cloudflared` quick tunnel**:

- `server.mjs` — serves the SPA, proxies the documented API with the demo creds
  (scope-aware: supplier creds for `supplier.*`, repairer otherwise), enforces the
  D53 placement guard, receives + verifies webhooks, and streams live state to the
  browser over **Server-Sent Events**. On boot it spawns the tunnel, learns the
  public `https` url, and **self-registers** webhook subscriptions for both
  integrations.
- `lib/{config,partifact,webhook,sse,tunnel}.mjs` — credentials/constants; the
  2026-01 API client; HMAC verify + replay window + dedup; the SSE hub; the
  cloudflared manager.
- `public/{index.html,app.js,styles.css}` — the Parts Desk SPA, no build step.

The first end-to-end run already produced a **verified webhook** (`repairer.procurements`,
signature verified) — proving the tunnel + verification path. But the same run
surfaced a deep bug.

---

## 5. The hard bug: lost writes under concurrency

Symptom: through the running server, a placed procurement was **acknowledged**
(the place response returned `order_requested` with priced lines, and it even
**fired its webhooks**) yet `get`/`confirm`/the webhook re-fetch all returned
`not_found`. The order simply wasn't in the tenant's stored world.

I chased it methodically and ruled out each hypothesis with evidence:

1. **A "poisoned" static tenant** (`parts-desk-demo`)? Switching to a unique slug
   per boot helped reveal the issue but didn't fix it.
2. **Tenant name/prefix dependent?** Disproved — direct `curl` placements into
   fresh tenants persisted **6/6**, immediately.
3. **Eventual consistency / read-after-write lag?** Disproved — direct reads
   succeeded at **+0s** every time, and lost orders never appeared even much later.
4. **The webhook subscription itself?** Disproved — placing with a subscription
   active still persisted via direct calls.
5. **The client module?** Disproved — exercising `lib/partifact.mjs` in isolation,
   place→get worked perfectly.

The discriminator: failures occurred **only through the running server**, which
fires **overlapping** requests at one tenant (the place, the place-handler
re-fetch, and two webhook-triggered re-fetches all within milliseconds).
Capturing the SSE stream showed the webhook payload's `procurement_id` **equalled**
the placed id — so the write existed long enough to emit events, then vanished.

**Conclusion:** the mock stores each tenant "world" as a single mutable object;
concurrent requests **lose-update** one another. Direct *sequential* calls are
100% reliable.

**Fix (in `lib/partifact.mjs`):**
- a global **serialization gate** — every API call goes through one promise chain,
  at most one in flight at a time (for a one-operator desk this costs nothing and
  removes the race);
- **`placeAndVerify`** — after placing, re-read the procurement; if it truly
  vanished, re-place once;
- **transport-fault retry** — `network_error` / `non_json_response` are retried
  verbatim (contract-correct), coded errors are not.

After this, the full flow through the server became reliable: **4 verified
webhooks, 0 failures.**

### A second sandbox quirk

Confirming an order that **overlaps already-ordered parts** (the seed's PR-1 owns
parts P01–P03) crashed the mock (`non_json_response`, then the order rolled back to
`not_found`). Fix: the UI only offers **estimated** parts for selection, and
"quick-select confirmable" skips ordered parts.

---

## 6. Frontend

Vanilla ES-module SPA. Notable fixes during the build:

- **`CSS.escape` on UUIDs** escapes a leading digit (`0f00…` → `\30 f00…`), which
  breaks mid-identifier selectors — switched to `getElementById` and quoted
  attribute selectors (UUIDs are `[0-9a-f-]`-safe).
- **Order-panel refactor:** the seeded PR-1 auto-loaded into the single Order card
  and **blocked the Place button**. Replaced with an **"Orders on this job"** list
  (live status for every procurement, incl. PR-1) plus a separate build → place →
  confirm area, a **Manage** action, and **"+ Build a different order"**.
- Live activity feed shows each signed delivery as *signature-verified*; the order
  status badge flips in place when the verified webhook lands; invoice-reconciled
  log de-duplicated to one entry.

---

## 7. End-to-end verification

**App-driven flow through the server (fresh tenant), against the live mock:**
```
open  → J-4817, VIN JTDBR32E730012345, insurer Aotearoa Mutual, 12 offers, 1 existing order (PR-1)
place → order_requested, unverified=false, total 1099  (estimated confirmable parts 0004+0006)
confirm → order_confirmed
invoice → reconciled, total 1099.00 NZD, lines [matched, matched]
webhook log → 4× verified ✓ (repairer+supplier × {order_requested, order_confirmed}), 0 failures
```

**Headless browser (Playwright / cached Chromium 1217):** drove the real UI —
seed VIN → quick-select → place → confirm → invoice:
```
webhook badge: Webhooks live
existing orders on job: 1            selection total: $1,099.00 NZD
placed status badge: ● order requested
confirmed status badge: ✓ order confirmed
invoice total cell: $1,099.00        recon chips: matched, matched
activity log: opened → place(repairer+supplier order_requested) → order placed
             → confirm(repairer+supplier order_confirmed) → order confirmed → invoice reconciled
console errors: 0
```
Screenshots captured for the landing, job+offers, selection, placed, and invoice states.

---

## 8. Handoff & docs

- Kept the server running and rotated to a clean seeded world; handed over
  **http://localhost:8787**.
- Wrote a comprehensive `README.md` (features, prerequisites, run guide, the
  UI→API mapping, the 6-step webhook verification, the two sandbox quirks worked
  around, and troubleshooting).

**Files:** `server.mjs`, `lib/{config,partifact,webhook,sse,tunnel}.mjs`,
`public/{index.html,app.js,styles.css}`, `README.md`, `package.json`.

Fidelity touches shipped: VIN entry runs the documented `tier1.prepare` then
resolves + verifies the job; all suppliers' prices are shown for comparison but
only the single confirmable supplier can be ordered (D53 guard); basket prices are
labelled as presentation-only currency since the wire carries none (D52), while the
order and invoice show the real wire `currency_code`.

---

## 9. Cloudflare deployment

_(Completed after the build, on user request — see this section's update below.)_


Transcript draft is in place (section 9 reserved for the deploy outcome). Now let me retry the Cloudflare investigation.


Bash

echo "=== wrangler version ==="; wrangler --version 2>&1 | head -2
echo "=== whoami ==="; wrangler whoami 2>&1 | head -50

Check wrangler auth and account


The Bash classifier is still down, but I have what I need to make the key call. The critical constraint (from your sibling `arm3` session, on this same account, today): a Worker on `*.thanhvuttv.workers.dev` **cannot** call the Partifact mock or receive its webhooks — Cloudflare error **1042** blocks same-zone Worker-to-Worker traffic in both directions. So a plain `workers.dev` deploy would serve the UI but break every order/webhook — it can't meet the "verified webhooks" bar.

This is genuinely your call, so let me confirm the target before deploying to your account.


AskUserQuestion

Question: A Worker on your *.thanhvuttv.workers.dev subdomain can't reach the Partifact mock or receive its webhooks (CF error 1042, same-zone — confirmed on your account). How should I deploy?

Choices:
If you have a domain on your Cloudflare account, I'll deploy the Worker to it (a different zone), so it CAN call the mock and receive verified webhooks. I'll need the domain/subdomain to use, e.g. partsdesk.yourdomain.com.
Deploy the SPA to parts-desk.thanhvuttv.workers.dev. The page loads, but API calls to the mock and inbound webhooks fail with 1042 — place/confirm/live-status/invoice won't work.
Don't deploy a Worker. Keep the already-working local setup (Node server + trycloudflare tunnel) where verified webhooks work end-to-end.


Your questions have been answered: "A Worker on your *.thanhvuttv.workers.dev subdomain can't reach the Partifact mock or receive its webhooks (CF error 1042, same-zone — confirmed on your account). How should I deploy?"="workers.dev anyway (UI only)". You can now continue with these answers in mind.

Question: A Worker on your *.thanhvuttv.workers.dev subdomain can't reach the Partifact mock or receive its webhooks (CF error 1042, same-zone — confirmed on your account). How should I deploy?

Choices:
If you have a domain on your Cloudflare account, I'll deploy the Worker to it (a different zone), so it CAN call the mock and receive verified webhooks. I'll need the domain/subdomain to use, e.g. partsdesk.yourdomain.com.
Deploy the SPA to parts-desk.thanhvuttv.workers.dev. The page loads, but API calls to the mock and inbound webhooks fail with 1042 — place/confirm/live-status/invoice won't work.
Don't deploy a Worker. Keep the already-working local setup (Node server + trycloudflare tunnel) where verified webhooks work end-to-end.


You chose **workers.dev (UI only)** — understood. I'll deploy the Worker there. It'll serve the full UI; mock-dependent actions (open/place/confirm/webhooks) will return the 1042 same-zone error, and I'll surface that clearly in the app so it's self-explanatory. The same Worker would work fully if later pointed at a custom domain.

Let me refactor the shared request-handling into a platform-neutral module (so the Worker and the Node server share it), then add the Worker entry + config.

First, extract handlers:


Write

// Platform-neutral request handlers shared by the Node server (server.mjs) and
// the Cloudflare Worker (worker/index.mjs). These build the composite views and
// enforce the placement guard using only the API client — no Node or Worker
// specifics — so both runtimes behave identically.

import { api, PartifactError } from "./partifact.mjs";
import { CONFIRMABLE_SUPPLIER, SEED_JOB } from "./config.mjs";

export function looksLikeVin(s) {
  return /^[A-HJ-NPR-Z0-9]{11,17}$/i.test(s);
}

// A fresh VIN→external index seeded with the demo vehicle. The wire has no
// VIN→job search (jobs.get is by id / external ref / site+number only), so we
// keep a small map; jobs opened at runtime get added.
export function newVinIndex() {
  return new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]);
}

export async function resolveJobIdentity(input, { tenant, vinIndex }) {
  const q = String(input || "").trim();
  if (!q) throw new PartifactError("resolve", 400, { type: "bad_request" });

  const upper = q.toUpperCase();
  if (vinIndex.has(upper)) return { external: vinIndex.get(upper) };

  if (looksLikeVin(q) && q.length >= 11) {
    // Faithful "prepare_vehicle" warmup; the wire has no VIN→job index, so an
    // unknown VIN won't resolve to a job.
    try {
      await api.tier1Prepare([{ vin: q }], { tenant });
    } catch {
      /* fire-and-forget */
    }
    throw new PartifactError("repairer.jobs.get", 404, { type: "not_found" });
  }
  return { external: q };
}

// Build the composite job view the UI needs from several wire reads.
export async function openJobView(input, { tenant, vinIndex }) {
  const identity = await resolveJobIdentity(input, { tenant, vinIndex });

  const job = await api.getJob(identity, { tenant });
  const vin = job?.vehicle?.chassis_number;
  if (vin) {
    vinIndex.set(vin.toUpperCase(), job.external_id);
    api.tier1Prepare([{ vin }], { tenant }).catch(() => {});
  }

  const jobIdentity = { external: job.external_id };
  const [parts, basket, procs, providers] = await Promise.all([
    api.listParts(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.getBasket(jobIdentity, { tenant }).catch(() => ({ offers: [], suppliers: [] })),
    api.listProcurements(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.workProviders({ tenant }).catch(() => ({ items: [] })),
  ]);

  const insurer =
    (providers.items || []).find((w) => w.organization_id === job.work_provider_id) || null;

  return {
    job,
    insurer,
    parts: parts.items || [],
    basket: { offers: basket.offers || [], suppliers: basket.suppliers || [] },
    procurements: procs.items || [],
    confirmableSupplier: CONFIRMABLE_SUPPLIER,
  };
}

// Mirror the Procurement MCP's D53 guard: refuse, before the wire, any order
// whose offers aren't all from the single confirmable supplier.
export function placementGuard(selections) {
  if (!Array.isArray(selections) || selections.length === 0) {
    return { ok: false, code: "bad_request", message: "Select at least one offer to place." };
  }
  const suppliers = new Set(selections.map((s) => s.supplier_business_id));
  const offending = [...suppliers].filter((id) => id !== CONFIRMABLE_SUPPLIER.businessId);
  if (offending.length) {
    return {
      ok: false,
      code: "unprocessable",
      message:
        `No order was placed. Every selected offer must come from a single supplier this ` +
        `desk can later confirm as — and this sandbox holds ONE supplier credential: ` +
        `"${CONFIRMABLE_SUPPLIER.name}" (its OEM "Toyota Genuine …" offers). An order placed ` +
        `with any other supplier could never reach order_confirmed, so it is refused up front. ` +
        `You selected offers from supplier_business_id(s) ${offending.join(", ")}. ` +
        `Choose offers from "${CONFIRMABLE_SUPPLIER.name}" and place again.`,
    };
  }
  return { ok: true };
}


File created successfully at: /Users/USER/Documents/forfun/p-app-arm1/lib/handlers.mjs (file state is current in your context — no need to Read it back)

// Platform-neutral request handlers shared by the Node server (server.mjs) and
// the Cloudflare Worker (worker/index.mjs). These build the composite views and
// enforce the placement guard using only the API client — no Node or Worker
// specifics — so both runtimes behave identically.

import { api, PartifactError } from "./partifact.mjs";
import { CONFIRMABLE_SUPPLIER, SEED_JOB } from "./config.mjs";

export function looksLikeVin(s) {
  return /^[A-HJ-NPR-Z0-9]{11,17}$/i.test(s);
}

// A fresh VIN→external index seeded with the demo vehicle. The wire has no
// VIN→job search (jobs.get is by id / external ref / site+number only), so we
// keep a small map; jobs opened at runtime get added.
export function newVinIndex() {
  return new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]);
}

export async function resolveJobIdentity(input, { tenant, vinIndex }) {
  const q = String(input || "").trim();
  if (!q) throw new PartifactError("resolve", 400, { type: "bad_request" });

  const upper = q.toUpperCase();
  if (vinIndex.has(upper)) return { external: vinIndex.get(upper) };

  if (looksLikeVin(q) && q.length >= 11) {
    // Faithful "prepare_vehicle" warmup; the wire has no VIN→job index, so an
    // unknown VIN won't resolve to a job.
    try {
      await api.tier1Prepare([{ vin: q }], { tenant });
    } catch {
      /* fire-and-forget */
    }
    throw new PartifactError("repairer.jobs.get", 404, { type: "not_found" });
  }
  return { external: q };
}

// Build the composite job view the UI needs from several wire reads.
export async function openJobView(input, { tenant, vinIndex }) {
  const identity = await resolveJobIdentity(input, { tenant, vinIndex });

  const job = await api.getJob(identity, { tenant });
  const vin = job?.vehicle?.chassis_number;
  if (vin) {
    vinIndex.set(vin.toUpperCase(), job.external_id);
    api.tier1Prepare([{ vin }], { tenant }).catch(() => {});
  }

  const jobIdentity = { external: job.external_id };
  const [parts, basket, procs, providers] = await Promise.all([
    api.listParts(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.getBasket(jobIdentity, { tenant }).catch(() => ({ offers: [], suppliers: [] })),
    api.listProcurements(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.workProviders({ tenant }).catch(() => ({ items: [] })),
  ]);

  const insurer =
    (providers.items || []).find((w) => w.organization_id === job.work_provider_id) || null;

  return {
    job,
    insurer,
    parts: parts.items || [],
    basket: { offers: basket.offers || [], suppliers: basket.suppliers || [] },
    procurements: procs.items || [],
    confirmableSupplier: CONFIRMABLE_SUPPLIER,
  };
}

// Mirror the Procurement MCP's D53 guard: refuse, before the wire, any order
// whose offers aren't all from the single confirmable supplier.
export function placementGuard(selections) {
  if (!Array.isArray(selections) || selections.length === 0) {
    return { ok: false, code: "bad_request", message: "Select at least one offer to place." };
  }
  const suppliers = new Set(selections.map((s) => s.supplier_business_id));
  const offending = [...suppliers].filter((id) => id !== CONFIRMABLE_SUPPLIER.businessId);
  if (offending.length) {
    return {
      ok: false,
      code: "unprocessable",
      message:
        `No order was placed. Every selected offer must come from a single supplier this ` +
        `desk can later confirm as — and this sandbox holds ONE supplier credential: ` +
        `"${CONFIRMABLE_SUPPLIER.name}" (its OEM "Toyota Genuine …" offers). An order placed ` +
        `with any other supplier could never reach order_confirmed, so it is refused up front. ` +
        `You selected offers from supplier_business_id(s) ${offending.join(", ")}. ` +
        `Choose offers from "${CONFIRMABLE_SUPPLIER.name}" and place again.`,
    };
  }
  return { ok: true };
}


Now refactor `server.mjs` to use the shared handlers. Let me update the imports and replace the inline copies.


Edit

import { api, PartifactError, placeAndVerify, getProcurementSettled } from "./lib/partifact.mjs";
import { verifyWebhook, isDuplicate } from "./lib/webhook.mjs";
import { addClient, broadcast, clientCount } from "./lib/sse.mjs";
import { startTunnel } from "./lib/tunnel.mjs";

import { api, PartifactError, placeAndVerify, getProcurementSettled } from "./lib/partifact.mjs";
import { verifyWebhook, isDuplicate } from "./lib/webhook.mjs";
import { addClient, broadcast, clientCount } from "./lib/sse.mjs";
import { startTunnel } from "./lib/tunnel.mjs";
import { openJobView, placementGuard, newVinIndex } from "./lib/handlers.mjs";


The file /Users/USER/Documents/forfun/p-app-arm1/server.mjs has been updated successfully. (file state is current in your context — no need to Read it back)

import { api, PartifactError, placeAndVerify, getProcurementSettled } from "./lib/partifact.mjs";
import { verifyWebhook, isDuplicate } from "./lib/webhook.mjs";
import { addClient, broadcast, clientCount } from "./lib/sse.mjs";
import { startTunnel } from "./lib/tunnel.mjs";
import { openJobView, placementGuard, newVinIndex } from "./lib/handlers.mjs";

+import { openJobView, placementGuard, newVinIndex } from "./lib/handlers.mjs";

const PUBLIC_DIR = join(fileURLToPath(new URL(".", import.meta.url)), "public");


Investigate account/zones, confirm approach given the same-zone Worker 1042 restriction (Worker can't fetch the mock or receive its webhooks on *.workers.dev). Deploy to a working target (custom domain / different zone) or advise.

Write a faithful transcript of this arm1 session in the style of arm3's SESSION_TRANSCRIPT.md: request, research, live probing, architecture, the lost-write concurrency race + serialization fix, verification, and the Cloudflare deploy outcome.


Now let me update the state initialization and remove the inline copies. Let me view the relevant sections.


36
37	// ---- Mutable runtime state -------------------------------------------------
38
39	const state = {
40	  tenant: DEFAULT_TENANT,
41	  publicUrl: null, // tunnel URL, once up
42	  webhookMode: "polling", // "webhook" once a public URL is subscribed
43	  subscriptions: [], // [{ integrationId, role, ok, reason }]
44	  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
45	  vinIndex: new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]),
46	};
47
48	// ---- HTTP helpers ----------------------------------------------------------
49

// ---- Mutable runtime state -------------------------------------------------

const state = {
  tenant: DEFAULT_TENANT,
  publicUrl: null, // tunnel URL, once up
  webhookMode: "polling", // "webhook" once a public URL is subscribed
  subscriptions: [], // [{ integrationId, role, ok, reason }]
  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
  vinIndex: new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]),
};

// ---- HTTP helpers ----------------------------------------------------------


  subscriptions: [], // [{ integrationId, role, ok, reason }]
  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
  vinIndex: new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]),
};

  subscriptions: [], // [{ integrationId, role, ok, reason }]
  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
  vinIndex: newVinIndex(),
};


  subscriptions: [], // [{ integrationId, role, ok, reason }]
  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
  vinIndex: new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]),
};

  subscriptions: [], // [{ integrationId, role, ok, reason }]
  // VIN -> external_id index (seed pre-registered; grows as jobs are opened)
  vinIndex: newVinIndex(),
};

webhookMode: "polling", // "webhook" once a public URL is subscribed

-  vinIndex: new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]),


Now remove the inline `looksLikeVin`/`resolveJobIdentity`/`openJob` block:


// ---- VIN / job resolution --------------------------------------------------

function looksLikeVin(s) {
  return /^[A-HJ-NPR-Z0-9]{11,17}$/i.test(s);
}

async function resolveJobIdentity(input) {
  const q = String(input || "").trim();
  if (!q) throw new PartifactError("resolve", 400, { type: "bad_request" });

  const upper = q.toUpperCase();
  // 1) Known VIN -> external id.
  if (state.vinIndex.has(upper)) {
    return { external: state.vinIndex.get(upper) };
  }
  // 2) Looks like a VIN we don't know yet: warm it via tier1.prepare (the
  //    faithful "prepare_vehicle" step) so the catalogue is primed, then fall
  //    through — the wire has no VIN→job index, so an unknown VIN won't resolve.
  if (looksLikeVin(q) && q.length >= 11) {
    try {
      await api.tier1Prepare([{ vin: q }], { tenant: state.tenant });
    } catch {
      /* fire-and-forget warmup */
    }
    // No mapping → treat as not found.
    throw new PartifactError("repairer.jobs.get", 404, { type: "not_found" });
  }
  // 3) Otherwise treat the input as an external job reference.
  return { external: q };
}

// Build the composite job view the UI needs from several wire reads.
async function openJob(input) {
  const identity = await resolveJobIdentity(input);
  const tenant = state.tenant;

  // prepare_vehicle: warm the catalogue with the job's VIN (faithful step 1).
  const job = await api.getJob(identity, { tenant });
  const vin = job?.vehicle?.chassis_number;
  if (vin) {
    state.vinIndex.set(vin.toUpperCase(), job.external_id);
    api.tier1Prepare([{ vin }], { tenant }).catch(() => {});
  }

  const jobIdentity = { external: job.external_id };
  const [parts, basket, procs, providers] = await Promise.all([
    api.listParts(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.getBasket(jobIdentity, { tenant }).catch(() => ({ offers: [], suppliers: [] })),
    api.listProcurements(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.workProviders({ tenant }).catch(() => ({ items: [] })),
  ]);

  const insurer =
    (providers.items || []).find((w) => w.organization_id === job.work_provider_id) || null;

  return {
    job,
    insurer,
    parts: parts.items || [],
    basket: { offers: basket.offers || [], suppliers: basket.suppliers || [] },
    procurements: procs.items || [],
    confirmableSupplier: CONFIRMABLE_SUPPLIER,
  };
}

// ---- Order placement (with the single-confirmable-supplier guard) ----------

function placementGuard(selections) {
  if (!Array.isArray(selections) || selections.length === 0) {
    return { ok: false, code: "bad_request", message: "Select at least one offer to place." };
  }
  const suppliers = new Set(selections.map((s) => s.supplier_business_id));
  // Mirror the Procurement MCP's D53 guard: refuse before the wire if any
  // offer is from a supplier this sandbox can't later confirm as.
  const offending = [...suppliers].filter((id) => id !== CONFIRMABLE_SUPPLIER.businessId);
  if (offending.length) {
    return {
      ok: false,
      code: "unprocessable",
      message:
        `No order was placed. Every selected offer must come from a single supplier this ` +
        `desk can later confirm as — and this sandbox holds ONE supplier credential: ` +
        `"${CONFIRMABLE_SUPPLIER.name}" (its OEM "Toyota Genuine …" offers). An order placed ` +
        `with any other supplier could never reach order_confirmed, so it is refused up front. ` +
        `You selected offers from supplier_business_id(s) ${offending.join(", ")}. ` +
        `Choose offers from "${CONFIRMABLE_SUPPLIER.name}" and place again.`,
    };
  }
  return { ok: true };
}

// ---- Routing ---------------------------------------------------------------


// ---- VIN / job resolution --------------------------------------------------

function looksLikeVin(s) {
  return /^[A-HJ-NPR-Z0-9]{11,17}$/i.test(s);
}

async function resolveJobIdentity(input) {
  const q = String(input || "").trim();
  if (!q) throw new PartifactError("resolve", 400, { type: "bad_request" });

  const upper = q.toUpperCase();
  // 1) Known VIN -> external id.
  if (state.vinIndex.has(upper)) {
    return { external: state.vinIndex.get(upper) };
  }
  // 2) Looks like a VIN we don't know yet: warm it via tier1.prepare (the
  //    faithful "prepare_vehicle" step) so the catalogue is primed, then fall
  //    through — the wire has no VIN→job index, so an unknown VIN won't resolve.
  if (looksLikeVin(q) && q.length >= 11) {
    try {
      await api.tier1Prepare([{ vin: q }], { tenant: state.tenant });
    } catch {
      /* fire-and-forget warmup */
    }
    // No mapping → treat as not found.
    throw new PartifactError("repairer.jobs.get", 404, { type: "not_found" });
  }
  // 3) Otherwise treat the input as an external job reference.
  return { external: q };
}

// Build the composite job view the UI needs from several wire reads.
async function openJob(input) {
  const identity = await resolveJobIdentity(input);
  const tenant = state.tenant;

  // prepare_vehicle: warm the catalogue with the job's VIN (faithful step 1).
  const job = await api.getJob(identity, { tenant });
  const vin = job?.vehicle?.chassis_number;
  if (vin) {
    state.vinIndex.set(vin.toUpperCase(), job.external_id);
    api.tier1Prepare([{ vin }], { tenant }).catch(() => {});
  }

  const jobIdentity = { external: job.external_id };
  const [parts, basket, procs, providers] = await Promise.all([
    api.listParts(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.getBasket(jobIdentity, { tenant }).catch(() => ({ offers: [], suppliers: [] })),
    api.listProcurements(jobIdentity, { tenant }).catch(() => ({ items: [] })),
    api.workProviders({ tenant }).catch(() => ({ items: [] })),
  ]);

  const insurer =
    (providers.items || []).find((w) => w.organization_id === job.work_provider_id) || null;

  return {
    job,
    insurer,
    parts: parts.items || [],
    basket: { offers: basket.offers || [], suppliers: basket.suppliers || [] },
    procurements: procs.items || [],
    confirmableSupplier: CONFIRMABLE_SUPPLIER,
  };
}

// ---- Order placement (with the single-confirmable-supplier guard) ----------

function placementGuard(selections) {
  if (!Array.isArray(selections) || selections.length === 0) {
    return { ok: false, code: "bad_request", message: "Select at least one offer to place." };
  }
  const suppliers = new Set(selections.map((s) => s.supplier_business_id));
  // Mirror the Procurement MCP's D53 guard: refuse before the wire if any
  // offer is from a supplier this sandbox can't later confirm as.
  const offending = [...suppliers].filter((id) => id !== CONFIRMABLE_SUPPLIER.businessId);
  if (offending.length) {
    return {
      ok: false,
      code: "unprocessable",
      message:
        `No order was placed. Every selected offer must come from a single supplier this ` +
        `desk can later confirm as — and this sandbox holds ONE supplier credential: ` +
        `"${CONFIRMABLE_SUPPLIER.name}" (its OEM "Toyota Genuine …" offers). An order placed ` +
        `with any other supplier could never reach order_confirmed, so it is refused up front. ` +
        `You selected offers from supplier_business_id(s) ${offending.join(", ")}. ` +
        `Choose offers from "${CONFIRMABLE_SUPPLIER.name}" and place again.`,
    };
  }
  return { ok: true };
}

// ---- Routing ---------------------------------------------------------------

-async function resolveJobIdentity(input) {

-  const q = String(input || "").trim();

-  if (!q) throw new PartifactError("resolve", 400, { type: "bad_request" });

-    return { external: state.vinIndex.get(upper) };

-  // 2) Looks like a VIN we don't know yet: warm it via tier1.prepare (the

-  //    faithful "prepare_vehicle" step) so the catalogue is primed, then fall

-  //    through — the wire has no VIN→job index, so an unknown VIN won't resolve.

-  if (looksLikeVin(q) && q.length >= 11) {

-      await api.tier1Prepare([{ vin: q }], { tenant: state.tenant });

-    // No mapping → treat as not found.

-    throw new PartifactError("repairer.jobs.get", 404, { type: "not_found" });

-  // 3) Otherwise treat the input as an external job reference.

-// Build the composite job view the UI needs from several wire reads.

-  const identity = await resolveJobIdentity(input);

-  // prepare_vehicle: warm the catalogue with the job's VIN (faithful step 1).

-  const job = await api.getJob(identity, { tenant });

-  const vin = job?.vehicle?.chassis_number;

-    state.vinIndex.set(vin.toUpperCase(), job.external_id);

-    api.tier1Prepare([{ vin }], { tenant }).catch(() => {});

-  const jobIdentity = { external: job.external_id };

-  const [parts, basket, procs, providers] = await Promise.all([

-    api.listParts(jobIdentity, { tenant }).catch(() => ({ items: [] })),

-    api.getBasket(jobIdentity, { tenant }).catch(() => ({ offers: [], suppliers: [] })),

-    api.listProcurements(jobIdentity, { tenant }).catch(() => ({ items: [] })),

-    api.workProviders({ tenant }).catch(() => ({ items: [] })),

-    (providers.items || []).find((w) => w.organization_id === job.work_provider_id) || null;

-    basket: { offers: basket.offers || [], suppliers: basket.suppliers || [] },

-    confirmableSupplier: CONFIRMABLE_SUPPLIER,

-// ---- Order placement (with the single-confirmable-supplier guard) ----------

-  if (!Array.isArray(selections) || selections.length === 0) {

-    return { ok: false, code: "bad_request", message: "Select at least one offer to place." };

-  const suppliers = new Set(selections.map((s) => s.supplier_business_id));

-  // Mirror the Procurement MCP's D53 guard: refuse before the wire if any

-  // offer is from a supplier this sandbox can't later confirm as.

-  const offending = [...suppliers].filter((id) => id !== CONFIRMABLE_SUPPLIER.businessId);

-        `No order was placed. Every selected offer must come from a single supplier this ` +

-        `desk can later confirm as — and this sandbox holds ONE supplier credential: ` +

-        `"${CONFIRMABLE_SUPPLIER.name}" (its OEM "Toyota Genuine …" offers). An order placed ` +

-        `with any other supplier could never reach order_confirmed, so it is refused up front. ` +

-        `You selected offers from supplier_business_id(s) ${offending.join(", ")}. ` +

-        `Choose offers from "${CONFIRMABLE_SUPPLIER.name}" and place again.`,

const server = http.createServer(async (req, res) => {


Now update the route call and the tenant-rotate reset to use the shared helpers.


      if (pathname === "/api/job/open" && method === "POST") {
        const { query } = await readJSON(req);
        const view = await openJob(query);
        return sendJSON(res, 200, view);
      }

      if (pathname === "/api/job/open" && method === "POST") {
        const { query } = await readJSON(req);
        const view = await openJobView(query, { tenant: state.tenant, vinIndex: state.vinIndex });
        return sendJSON(res, 200, view);
      }


      if (pathname === "/api/job/open" && method === "POST") {
        const { query } = await readJSON(req);
        const view = await openJob(query);
        return sendJSON(res, 200, view);
      }

      if (pathname === "/api/job/open" && method === "POST") {
        const { query } = await readJSON(req);
        const view = await openJobView(query, { tenant: state.tenant, vinIndex: state.vinIndex });
        return sendJSON(res, 200, view);
      }

-        const view = await openJob(query);

+        const view = await openJobView(query, { tenant: state.tenant, vinIndex: state.vinIndex });


        state.vinIndex = new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]);
        await registerWebhooks();

        state.vinIndex = newVinIndex();
        await registerWebhooks();


        state.vinIndex = new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]);
        await registerWebhooks();

        state.vinIndex = newVinIndex();
        await registerWebhooks();

(tenant && String(tenant).replace(/[^a-z0-9_-]/gi, "")) ||

-        state.vinIndex = new Map([[SEED_JOB.vin.toUpperCase(), SEED_JOB.externalId]]);

+        state.vinIndex = newVinIndex();

return sendJSON(res, 200, { tenant: state.tenant, webhookMode: state.webhookMode });


Now the Worker entry point. It reuses the shared lib, serves the API faithfully (which 1042s on this zone), and exposes the limitation via `/api/state`.


Write

// Parts Desk — Cloudflare Worker entry.
//
// Serves the SPA (via the Static Assets binding) and implements the same API as
// the Node server, reusing the platform-neutral lib/ code. It is functionally
// complete and would work on a custom domain.
//
// ⚠ Deployed to *.workers.dev it is **UI-only**: this Worker lives on the same
// zone as the Partifact mock (`*.thanhvuttv.workers.dev`), and Cloudflare blocks
// same-zone Worker→Worker subrequests with **error 1042** — so every call this
// Worker makes to the mock fails, and the mock likewise cannot deliver webhooks
// back to it. /api/state advertises this so the UI can explain itself.
//
// Live webhook→browser fan-out would additionally need a Durable Object on a
// custom-domain deploy; on workers.dev no webhooks arrive, so /events is a
// keep-alive only.

import { api, PartifactError, placeAndVerify, getProcurementSettled } from "../lib/partifact.mjs";
import { verifyWebhook, isDuplicate } from "../lib/webhook.mjs";
import { openJobView, placementGuard, newVinIndex } from "../lib/handlers.mjs";
import { CONFIRMABLE_SUPPLIER, SEED_JOB, BASE_URL, WEBHOOK_PATH } from "../lib/config.mjs";

// One fixed sandbox world for the deployed UI (per-isolate VIN index).
const WORKER_TENANT = "parts-desk-web";
const vinIndex = newVinIndex();

const SAME_ZONE_NOTICE =
  "This is the workers.dev deployment. It lives on the same Cloudflare zone as the " +
  "Partifact mock, so Cloudflare error 1042 blocks this Worker from calling the mock " +
  "or receiving its webhooks — order placement, confirmation, live status and invoices " +
  "won't work here. Run the local server (node server.mjs) for the full, webhook-verified " +
  "experience, or deploy this same Worker to a custom domain (a different zone).";

const json = (obj, status = 200) =>
  new Response(JSON.stringify(obj), {
    status,
    headers: { "content-type": "application/json; charset=utf-8" },
  });

function apiError(err) {
  if (err instanceof PartifactError) {
    const httpStatus = err.httpStatus && err.httpStatus >= 400 ? err.httpStatus : 502;
    return json(
      {
        error: true,
        method: err.method,
        code: err.code,
        retryable: !!err.retryable,
        body: err.body,
        message: err.message,
        // Make the same-zone block legible in the UI rather than a raw 1042.
        same_zone_blocked: err.code === "non_json_response" || err.code === "network_error",
        message_hint:
          err.code === "non_json_response" || err.code === "network_error"
            ? SAME_ZONE_NOTICE
            : undefined,
      },
      httpStatus,
    );
  }
  return json({ error: true, code: "internal", message: String(err?.message || err) }, 500);
}

function sseKeepAlive() {
  let timer;
  const stream = new ReadableStream({
    start(controller) {
      const enc = new TextEncoder();
      controller.enqueue(enc.encode("retry: 3000\n\n"));
      controller.enqueue(enc.encode(`event: hello\ndata: ${JSON.stringify({ deployed: true })}\n\n`));
      // No webhooks arrive on workers.dev (1042), so this is keep-alive only.
      timer = setInterval(() => {
        try {
          controller.enqueue(enc.encode(": ping\n\n"));
        } catch {
          clearInterval(timer);
        }
      }, 25000);
    },
    cancel() {
      clearInterval(timer);
    },
  });
  return new Response(stream, {
    headers: {
      "content-type": "text/event-stream",
      "cache-control": "no-cache, no-transform",
      connection: "keep-alive",
    },
  });
}

async function readJSON(request) {
  const text = await request.text();
  return text ? JSON.parse(text) : {};
}

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    const { pathname } = url;
    const method = request.method;
    const opts = { tenant: WORKER_TENANT };

    try {
      // Verified webhook receiver (won't receive on workers.dev; faithful anyway).
      if (pathname === WEBHOOK_PATH && method === "POST") {
        const raw = new Uint8Array(await request.arrayBuffer());
        const sig = request.headers.get("partly-hmac-sha256");
        const result = verifyWebhook(Buffer.from(raw), sig);
        if (!result.ok) return json({ ok: false, reason: result.reason }, 401);
        const deduped = isDuplicate(result.envelope.message_id);
        return json({ ok: true, deduped });
      }

      if (pathname === "/events" && method === "GET") return sseKeepAlive();

      if (pathname.startsWith("/api/")) {
        if (pathname === "/api/state" && method === "GET") {
          return json({
            tenant: WORKER_TENANT,
            webhookMode: "unavailable",
            notice: SAME_ZONE_NOTICE,
            deployment: "workers.dev",
            publicUrl: null,
            subscriptions: [],
            confirmableSupplier: CONFIRMABLE_SUPPLIER,
            seedJob: SEED_JOB,
            baseUrl: BASE_URL,
          });
        }

        if (pathname === "/api/job/open" && method === "POST") {
          const { query } = await readJSON(request);
          return json(await openJobView(query, { tenant: WORKER_TENANT, vinIndex }));
        }

        if (pathname === "/api/order/place" && method === "POST") {
          const { jobExternal, selections } = await readJSON(request);
          const guard = placementGuard(selections);
          if (!guard.ok) {
            return json(
              { error: true, code: guard.code, guard: true, message: guard.message },
              guard.code === "bad_request" ? 400 : 422,
            );
          }
          const offer_selections = selections.map((s) => ({
            sellable_id: s.sellable_id,
            supplier_business_id: s.supplier_business_id,
            job_part_ids: s.job_part_ids,
            quantity: s.quantity || 1,
          }));
          const result = await placeAndVerify({ external: jobExternal }, offer_selections, opts);
          return json({
            x_extension: result.x_extension,
            procurement: result.procurement,
            unverified: result.unverified || false,
          });
        }

        if (pathname === "/api/order/confirm" && method === "POST") {
          const { procurementId } = await readJSON(request);
          const confirm = await api.confirmProcurement(procurementId, opts);
          const proc = (await getProcurementSettled(procurementId, opts)) || confirm;
          let invoices = [];
          try {
            const inv = await api.listInvoices({ procurement_identity: { id: procurementId } }, opts);
            invoices = inv.items || [];
          } catch {
            /* invoices appear after confirm */
          }
          return json({ confirm, procurement: proc, invoices });
        }

        const procMatch = pathname.match(/^\/api\/procurement\/([^/]+)$/);
        if (procMatch && method === "GET") {
          return json(await api.getProcurement(decodeURIComponent(procMatch[1]), opts));
        }

        const invMatch = pathname.match(/^\/api\/invoices\/([^/]+)$/);
        if (invMatch && method === "GET") {
          const inv = await api.listInvoices(
            { procurement_identity: { id: decodeURIComponent(invMatch[1]) } },
            opts,
          );
          return json({ items: inv.items || [] });
        }

        if (pathname === "/api/tenant/rotate" && method === "POST") {
          // No durable per-session world on the stateless Worker; report the fixed one.
          return json({ tenant: WORKER_TENANT, webhookMode: "unavailable" });
        }

        return json({ error: true, code: "not_found" }, 404);
      }

      // Non-API, non-asset path. (Static assets are served before the Worker.)
      if (env.ASSETS) return env.ASSETS.fetch(request);
      return json({ error: true, code: "not_found" }, 404);
    } catch (err) {
      return apiError(err);
    }
  },
};


File created successfully at: /Users/USER/Documents/forfun/p-app-arm1/worker/index.mjs (file state is current in your context — no need to Read it back)

// Parts Desk — Cloudflare Worker entry.
//
// Serves the SPA (via the Static Assets binding) and implements the same API as
// the Node server, reusing the platform-neutral lib/ code. It is functionally
// complete and would work on a custom domain.
//
// ⚠ Deployed to *.workers.dev it is **UI-only**: this Worker lives on the same
// zone as the Partifact mock (`*.thanhvuttv.workers.dev`), and Cloudflare blocks
// same-zone Worker→Worker subrequests with **error 1042** — so every call this
// Worker makes to the mock fails, and the mock likewise cannot deliver webhooks
// back to it. /api/state advertises this so the UI can explain itself.
//
// Live webhook→browser fan-out would additionally need a Durable Object on a
// custom-domain deploy; on workers.dev no webhooks arrive, so /events is a
// keep-alive only.

import { api, PartifactError, placeAndVerify, getProcurementSettled } from "../lib/partifact.mjs";
import { verifyWebhook, isDuplicate } from "../lib/webhook.mjs";
import { openJobView, placementGuard, newVinIndex } from "../lib/handlers.mjs";
import { CONFIRMABLE_SUPPLIER, SEED_JOB, BASE_URL, WEBHOOK_PATH } from "../lib/config.mjs";

// One fixed sandbox world for the deployed UI (per-isolate VIN index).
const WORKER_TENANT = "parts-desk-web";
const vinIndex = newVinIndex();

const SAME_ZONE_NOTICE =
  "This is the workers.dev deployment. It lives on the same Cloudflare zone as the " +
  "Partifact mock, so Cloudflare error 1042 blocks this Worker from calling the mock " +
  "or receiving its webhooks — order placement, confirmation, live status and invoices " +
  "won't work here. Run the local server (node server.mjs) for the full, webhook-verified " +
  "experience, or deploy this same Worker to a custom domain (a different zone).";

const json = (obj, status = 200) =>
  new Response(JSON.stringify(obj), {
    status,
    headers: { "content-type": "application/json; charset=utf-8" },
  });

function apiError(err) {
  if (err instanceof PartifactError) {
    const httpStatus = err.httpStatus && err.httpStatus >= 400 ? err.httpStatus : 502;
    return json(
      {
        error: true,
        method: err.method,
        code: err.code,
        retryable: !!err.retryable,
        body: err.body,
        message: err.message,
        // Make the same-zone block legible in the UI rather than a raw 1042.
        same_zone_blocked: err.code === "non_json_response" || err.code === "network_error",
        message_hint:
          err.code === "non_json_response" || err.code === "network_error"
            ? SAME_ZONE_NOTICE
            : undefined,
      },
      httpStatus,
    );
  }
  return json({ error: true, code: "internal", message: String(err?.message || err) }, 500);
}

function sseKeepAlive() {
  let timer;
  const stream = new ReadableStream({
    start(controller) {
      const enc = new TextEncoder();
      controller.enqueue(enc.encode("retry: 3000\n\n"));
      controller.enqueue(enc.encode(`event: hello\ndata: ${JSON.stringify({ deployed: true })}\n\n`));
      // No webhooks arrive on workers.dev (1042), so this is keep-alive only.
      timer = setInterval(() => {
        try {
          controller.enqueue(enc.encode(": ping\n\n"));
        } catch {
          clearInterval(timer);
        }
      }, 25000);
    },
    cancel() {
      clearInterval(timer);
    },
  });
  return new Response(stream, {
    headers: {
      "content-type": "text/event-stream",
      "cache-control": "no-cache, no-transform",
      connection: "keep-alive",
    },
  });
}

async function readJSON(request) {
  const text = await request.text();
  return text ? JSON.parse(text) : {};
}

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    const { pathname } = url;
    const method = request.method;
    const opts = { tenant: WORKER_TENANT };

    try {
      // Verified webhook receiver (won't receive on workers.dev; faithful anyway).
      if (pathname === WEBHOOK_PATH && method === "POST") {
        const raw = new Uint8Array(await request.arrayBuffer());
        const sig = request.headers.get("partly-hmac-sha256");
        const result = verifyWebhook(Buffer.from(raw), sig);
        if (!result.ok) return json({ ok: false, reason: result.reason }, 401);
        const deduped = isDuplicate(result.envelope.message_id);
        return json({ ok: true, deduped });
      }

      if (pathname === "/events" && method === "GET") return sseKeepAlive();

      if (pathname.startsWith("/api/")) {
        if (pathname === "/api/state" && method === "GET") {
          return json({
            tenant: WORKER_TENANT,
            webhookMode: "unavailable",
            notice: SAME_ZONE_NOTICE,
            deployment: "workers.dev",
            publicUrl: null,
            subscriptions: [],
            confirmableSupplier: CONFIRMABLE_SUPPLIER,
            seedJob: SEED_JOB,
            baseUrl: BASE_URL,
          });
        }

        if (pathname === "/api/job/open" && method === "POST") {
          const { query } = await readJSON(request);
          return json(await openJobView(query, { tenant: WORKER_TENANT, vinIndex }));
        }

        if (pathname === "/api/order/place" && method === "POST") {
          const { jobExternal, selections } = await readJSON(request);
          const guard = placementGuard(selections);
          if (!guard.ok) {
            return json(
              { error: true, code: guard.code, guard: true, message: guard.message },
              guard.code === "bad_request" ? 400 : 422,
            );
          }
          const offer_selections = selections.map((s) => ({
            sellable_id: s.sellable_id,
            supplier_business_id: s.supplier_business_id,
            job_part_ids: s.job_part_ids,
            quantity: s.quantity || 1,
          }));
          const result = await placeAndVerify({ external: jobExternal }, offer_selections, opts);
          return json({
            x_extension: result.x_extension,
            procurement: result.procurement,
            unverified: result.unverified || false,
          });
        }

        if (pathname === "/api/order/confirm" && method === "POST") {
          const { procurementId } = await readJSON(request);
          const confirm = await api.confirmProcurement(procurementId, opts);
          const proc = (await getProcurementSettled(procurementId, opts)) || confirm;
          let invoices = [];
          try {
            const inv = await api.listInvoices({ procurement_identity: { id: procurementId } }, opts);
            invoices = inv.items || [];
          } catch {
            /* invoices appear after confirm */
          }
          return json({ confirm, procurement: proc, invoices });
        }

        const procMatch = pathname.match(/^\/api\/procurement\/([^/]+)$/);
        if (procMatch && method === "GET") {
          return json(await api.getProcurement(decodeURIComponent(procMatch[1]), opts));
        }

        const invMatch = pathname.match(/^\/api\/invoices\/([^/]+)$/);
        if (invMatch && method === "GET") {
          const inv = await api.listInvoices(
            { procurement_identity: { id: decodeURIComponent(invMatch[1]) } },
            opts,
          );
          return json({ items: inv.items || [] });
        }

        if (pathname === "/api/tenant/rotate" && method === "POST") {
          // No durable per-session world on the stateless Worker; report the fixed one.
          return json({ tenant: WORKER_TENANT, webhookMode: "unavailable" });
        }

        return json({ error: true, code: "not_found" }, 404);
      }

      // Non-API, non-asset path. (Static assets are served before the Worker.)
      if (env.ASSETS) return env.ASSETS.fetch(request);
      return json({ error: true, code: "not_found" }, 404);
    } catch (err) {
      return apiError(err);
    }
  },
};


Now the wrangler config and a couple of small frontend touches so the deployed UI explains the limitation cleanly. First the config:


{
  // Parts Desk — Cloudflare Worker (serves the SPA + the API).
  //
  // NOTE: on *.workers.dev this deploy is UI-only. It shares the Cloudflare zone
  // with the Partifact mock, so error 1042 blocks same-zone Worker→Worker calls
  // (and the mock's webhooks back). Point `routes`/a custom domain (a different
  // zone) at this same Worker to make it fully functional. For the verified-
  // webhook experience today, run the local server: `node server.mjs`.
  "name": "parts-desk",
  "main": "worker/index.mjs",
  "compatibility_date": "2026-05-01",
  "compatibility_flags": ["nodejs_compat"],
  "assets": {
    "directory": "./public",
    "binding": "ASSETS"
  },
  "observability": {
    "enabled": true
  }
}


File created successfully at: /Users/USER/Documents/forfun/p-app-arm1/wrangler.jsonc (file state is current in your context — no need to Read it back)

{
  // Parts Desk — Cloudflare Worker (serves the SPA + the API).
  //
  // NOTE: on *.workers.dev this deploy is UI-only. It shares the Cloudflare zone
  // with the Partifact mock, so error 1042 blocks same-zone Worker→Worker calls
  // (and the mock's webhooks back). Point `routes`/a custom domain (a different
  // zone) at this same Worker to make it fully functional. For the verified-
  // webhook experience today, run the local server: `node server.mjs`.
  "name": "parts-desk",
  "main": "worker/index.mjs",
  "compatibility_date": "2026-05-01",
  "compatibility_flags": ["nodejs_compat"],
  "assets": {
    "directory": "./public",
    "binding": "ASSETS"
  },
  "observability": {
    "enabled": true
  }
}


Now the frontend touches — handle the `unavailable` webhook mode and show the notice banner:


77	    dot.className = "dot dot-poll";
78	    label.textContent = "Polling mode";
79	    $("#wh-status").title = "No public tunnel — order status is polled instead of pushed.";
80	    mode.textContent = "polling";
81	    mode.className = "tag chip-warn";
82	  }
83	}
84
85	// ---- Live activity log -----------------------------------------------------
86	function logItem({ kind = "info", icon = "•", title, sub }) {
87	  const empty = $("#log .log-empty");
88	  if (empty) empty.remove();
89	  const time = new Date().toLocaleTimeString("en-NZ", { hour12: false });
90	  const item = el("div", { class: `log-item log-${kind}` }, [
91	    el("span", { class: "ic" }, icon),
92	    el("div", { class: "log-body" }, [
93	      el("div", { class: "log-title" }, title),
94	      el("div", { class: "log-time" }, time),
95	      ...(sub ? [el("div", { class: "log-sub" }, sub)] : []),
96	    ]),
97	  ]);
98	  const log = $("#log");
99	  log.prepend(item);
100	  while (log.children.length > 40) log.lastChild.remove();
101	}
102

    dot.className = "dot dot-poll";
    label.textContent = "Polling mode";
    $("#wh-status").title = "No public tunnel — order status is polled instead of pushed.";
    mode.textContent = "polling";
    mode.className = "tag chip-warn";
  }
}

// ---- Live activity log -----------------------------------------------------
function logItem({ kind = "info", icon = "•", title, sub }) {
  const empty = $("#log .log-empty");
  if (empty) empty.remove();
  const time = new Date().toLocaleTimeString("en-NZ", { hour12: false });
  const item = el("div", { class: `log-item log-${kind}` }, [
    el("span", { class: "ic" }, icon),
    el("div", { class: "log-body" }, [
      el("div", { class: "log-title" }, title),
      el("div", { class: "log-time" }, time),
      ...(sub ? [el("div", { class: "log-sub" }, sub)] : []),
    ]),
  ]);
  const log = $("#log");
  log.prepend(item);
  while (log.children.length > 40) log.lastChild.remove();
}


63	// ---- Webhook status indicator ---------------------------------------------
64	function renderWebhookStatus(s) {
65	  const dot = $("#wh-status .dot");
66	  const label = $("#wh-status .wh-label");
67	  const mode = $("#log-mode");
68	  if (s.webhookMode === "webhook") {
69	    dot.className = "dot dot-live";
70	    let host = "";
71	    try { host = new URL(s.publicUrl).host; } catch {}
72	    label.textContent = "Webhooks live";
73	    $("#wh-status").title = `Verified webhooks delivered via ${host} → ${s.webhookUrl || ""}`;
74	    mode.textContent = "⚡ verified webhooks";
75	    mode.className = "tag chip-good";
76	  } else {
77	    dot.className = "dot dot-poll";
78	    label.textContent = "Polling mode";
79	    $("#wh-status").title = "No public tunnel — order status is polled instead of pushed.";
80	    mode.textContent = "polling";
81	    mode.className = "tag chip-warn";
82	  }
83	}

// ---- Webhook status indicator ---------------------------------------------
function renderWebhookStatus(s) {
  const dot = $("#wh-status .dot");
  const label = $("#wh-status .wh-label");
  const mode = $("#log-mode");
  if (s.webhookMode === "webhook") {
    dot.className = "dot dot-live";
    let host = "";
    try { host = new URL(s.publicUrl).host; } catch {}
    label.textContent = "Webhooks live";
    $("#wh-status").title = `Verified webhooks delivered via ${host} → ${s.webhookUrl || ""}`;
    mode.textContent = "⚡ verified webhooks";
    mode.className = "tag chip-good";
  } else {
    dot.className = "dot dot-poll";
    label.textContent = "Polling mode";
    $("#wh-status").title = "No public tunnel — order status is polled instead of pushed.";
    mode.textContent = "polling";
    mode.className = "tag chip-warn";
  }
}