# Supplier API handoff — completed local walkthrough and Gateway repair

19 September 2026. Completed the required supplier-call-and-note course against running AppEngine0.132.0 and Studio0.6.2, using the authorized learner organization `ck-local-mu83iwh3`, its staff session and Lina’s reservation `6aae607128eaa92a3d2a0b45` from the connected-client prerequisite. Supplier servers were explicit loopback test fixtures, separate from the real AppEngine backend.

## Running-product results

| Step | Actual result |
| --- | --- |
| Gateway navigation | Configuration→Integration Config opened Gateway Manager; Configurations, Integration Builder and API Playground inspected. Existing learner SMTP capture configuration visible. |
| Catalog and schema | Authenticated discovery200,58 entries including helper/blank entries; HTTP search0; no generic HTTP/REST or Zapier provider. Actual SMTP generated form inspected without saving or invoking Test. Its schema matches the catalog. |
| Supplier-only checks | Exact downloaded fixture: NW-OAK-24→200/12units/3weeks; EMPTY→200/0units; bad test key→401; FAIL→503. |
| Exact adapter success | Downloadable `check-supplier.mjs NW-OAK-24` exited0 and returned `noteVerified:true`, checkedAt`2026-09-19T10:26:08.940Z`. Actual Notes POST201 followed by exact matching GET200. |
| Persistence | Initial note list0; after adapter1. Note remains exactly unchanged after every failure and after the coordinated API restart. No second successful adapter write was performed. |
| Credential/upstream failures | Exact adapter exits1 for401 and503; real Notes GET confirms no additional or changed note. Missing required environment configuration also exits1. |
| Response/timeout failures | Added a separately labelled loopback fault fixture. Mismatched SKU, negative availability, numeric string, missing fields, malformed JSON and six-second delay all fail the exact adapter. Five-second timeout observed at5051ms; actual Notes GET unchanged after each. |
| Gateway/auth errors | Missingorg400, missingbearer401, unregistered TutorialNorthwindProvider404 reproduced against the local API. |
| Gateway defect and repair | `/upstream/active` initially500; Playground falsely empty despite the saved SMTP config. Both application defects repaired below, then verified through real API/UI. |
| Fixed API | After rebuild, empty process registry200/[]; after an actual local-captured SMTP message, list200 with own SMTP metadata; SMTP type filter200/1; unknown type200/[]; detail200 JSON object. |
| Fixed UI | Available Configurations lists `tutorial-local-mail-capture`; selecting it displays sendEmail schema. A browser-local503 injection shows explicit load failure, not empty state; Retry restores real network requests and displays the actual saved SMTP configuration. No Playground operation executed. |

The course’s required Parts1–3 and their Try it exercises are complete. Part4 is explicitly a separate optional maintainer implementation project, not a deployed provider prerequisite. No external supplier order, production call, generic-provider implementation/deployment, inbound webhook or background supplier schedule was performed.

## Gateway application defects and changes

The active API returned live provider instances. A real SMTP instance contains circular nodemailer transport references, so serialization fails; returning a simpler provider could also expose its server configuration. HTTP list/detail now return only explicit metadata: instance/configuration IDs, name, provider/type, operations and use cases. The internal live instance stays intact. Empty organization registries and missing type matches return arrays. Detail now awaits the service result instead of JSON-stringifying a Promise into an empty object.

The Playground independently filtered only `config.data.status === 'active'` or a legacy default flag. Actual saved configurations can omit status, although the configuration loader treats those as enabled. It now includes those legacy records, excludes explicitly inactive/error/testing entries even when marked default, and calls the list **Available Configurations** to distinguish saved configuration from a cached runtime instance. Loading failures and malformed loader responses produce an error/retry state rather than a false empty state.

Application files changed:

- `/Users/imzee/projects/appengine/src/upstream/upstream.register.ts`
- `/Users/imzee/projects/appengine/src/upstream/upstream.service.ts`
- `/Users/imzee/projects/appengine/src/upstream/upstream.controller.ts`
- `/Users/imzee/projects/appengine/src/upstream/upstream-active.spec.ts` — new focused regression suite.
- `/Users/imzee/projects/websitemint/packages/ui/src/components/configuration/gateway/gateway-playground.tsx`
- `/Users/imzee/projects/websitemint/packages/ui/src/components/configuration/gateway/gateway-store.ts`
- `/Users/imzee/projects/websitemint/packages/ui/src/components/configuration/gateway/__tests__/gateway-availability.test.cjs` — new focused regression suite.

Pre-existing working-tree changes were preserved. No gateway credentials, shared-provider configuration or application permission policy was changed by this repair.

## Validation and local reload

- Backend Jest:3tests pass using a real initialized SMTP/nodemailer instance with no network connection. Tests reproduce raw-instance serialization failure; verify safe metadata, live-instance preservation, empty/type-filtered results, tenant isolation and resolved detail objects.
- Frontend Node tests:3pass for legacy configuration availability, explicit inactive/default behavior, successful empty results and load/malformed-response failures.
- Coordinated AppEngine `nest build` passed with the repository’s8GB development heap. The first default4GB attempt exhausted its heap before any worker restart. Existing private `dist/envs` files were backed up and preserved.
- With parent/team writes paused, only verified local3300 PID3110 was replaced. Rebuilt worker PID33704 returned healthy200. This single build also included the other agents’ pending validator and scheduling fixes; those agents own their separate tests/reports.
- After restart, a recovery-link email for the controlled Kofi account was captured only by the organization’s loopback SMTP catcher to initialize a real active instance for verification. The link was not followed and no password reset was performed. Raw mail stays private. The active list and detail then returned the expected safe SMTP metadata.
- Actual Studio HMR/render and error/retry captures verify the frontend change. Source/document whitespace checks and evidence secret checks passed.

## Evidence

- [Actual API ledger](assets/local-custom-api/api-results.json), including initial500 and repaired200 responses, owned note readbacks, auth errors and provider catalog.
- [Exact adapter/supplier results](assets/local-custom-api/supplier-results.json).
- [Malformed/timeout results and unchanged-note checks](assets/local-custom-api/supplier-fault-results.json), [runnable fault fixture](assets/local-custom-api/supplier-fault-fixture.mjs).
- [Gateway configurations](assets/local-custom-api/01-gateway-configurations.png), [catalog](assets/local-custom-api/02-provider-catalog.png), [HTTP search](assets/local-custom-api/03-http-search.png), [unsaved SMTP form](assets/local-custom-api/04-smtp-schema.png).
- [False empty state before repair](assets/local-custom-api/05-playground-before.png), [fixed available configuration](assets/local-custom-api/06-playground-fixed.png), [controlled load error](assets/local-custom-api/07-playground-load-error.png), [successful retry/operation schema](assets/local-custom-api/08-playground-retry.png).
- [Actual note readback transcript](assets/local-custom-api/09-note-readback.png), [HTML transcript](assets/local-custom-api/09-note-readback.html). This is explicitly a sanitized HTTP transcript, not a claimed product Notes screen.

Private credentials remain outside the repository. The SMTP catcher stays running for the parent task’s controlled local workflows. The task-owned supplier and browser-client fixture listeners were stopped after verification; the downloadable fixtures remain available for reproduction. The API response change intentionally excludes raw provider objects/configuration; consumers of the previously failing/unsafe active endpoint should use its metadata fields.