# RC6 WhatsApp Cloud API Closure Receipt

**Closure state:** `CLOSED — ACTIVE SYNTHETIC-ONLY MANAGED CANARY`  
**Exact proven source:** `8838b7a6d726a5aed44ce21a39506c1265a98d15`  
**Managed run:** `30137700769`  
**Governing tracker:** Issue #261  
**Initial failure receipt:** Issue #404

## Proven managed path

The exact-current-main managed canary completed the bounded RC6 path:

```text
DIREKT transactional outbox
  -> backend-owned Meta Cloud API adapter
  -> Meta hello_world test template
  -> one owner-controlled verified test recipient
  -> authentic HMAC-verified Meta webhook
  -> durable signed delivery receipt in DIREKT
```

The first attempt failed during Google Cloud CLI setup before Secret Manager resolution, image deployment, Cloud Run mutation or Meta activity. That failure remains preserved in Issue #404. Retrying only the failed jobs on the same run and exact source succeeded through:

- permanent RC6 source and privacy contract verification;
- GitHub OIDC authentication;
- enabled numeric Secret Manager version resolution;
- immutable Artifact Registry image push;
- isolated webhook deployment with the webhook-only service identity;
- verification that the public webhook had no send-token or synthetic-recipient secret access;
- private synthetic send-job deployment;
- transactional outbox processing;
- Meta test-template acceptance;
- authentic signed webhook receipt persistence;
- sanitized managed-canary receipt publication.

## Preserved security and privacy boundaries

- WhatsApp send authority remains backend-owned.
- Android and browser clients receive no Meta credentials and cannot decide delivery truth.
- The public webhook identity remains separate from the private send identity.
- Raw participant phone numbers are not stored in the outbox or published evidence.
- Payloads remain approved-template only and exclude identity documents, certificates, raw evidence, tokens, exact private coordinates, reviewer notes and unrestricted free text.
- Consent and channel opt-out are rechecked at send time.
- Duplicate and out-of-order webhook events remain idempotently guarded.
- Provider failures cannot become delivered state or erase original failure evidence.

## Authorization boundary

This receipt proves only the synthetic/test managed checkpoint. It does **not** authorize:

- participant or production WhatsApp delivery;
- a production WhatsApp phone number or production templates;
- real participant admission or production authentication;
- Maps or payment activation;
- Phase 11 exit or Phase 12 production release.

`WHATSAPP_PROVIDER_MODE` remains fail-closed by default, and participant/production delivery remains disabled until separate business, provider, legal, privacy and release approvals are recorded.

## Lane handoff

RC6 is closed and preserved. RC5 Firebase Test Lab resumes as the sole active Issue #261 lane. RC5 remains open until final owner-side resource verification and an exact-current-main managed Test Lab matrix succeed with sanitized evidence. RC7 must not start while RC5 remains open unless the owner explicitly re-coordinates the sequence.
