## Description
Some inbound WhatsApp calls stayed stuck in "ringing" forever. When a
caller hung up within ~1s of dialing, Meta delivered the terminate
webhook before the connect webhook. The terminate arrived with no call
record yet and was dropped, then connect created the call in ringing
with nothing left to close it. These calls now correctly land as missed
(no_answer), and an agent who taps Accept on a call that already ended
gets a clean "call ended" instead of a generic error.
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
- local UI testing
## Checklist:
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
Adds the Meta WhatsApp Cloud API surface needed for browser-based
calling. This is the second slice of the WhatsApp calling feature,
sitting on top of `feat/voice-call-model-wiring` and consumed by later
PRs (incoming-webhook pipeline, call service, frontend).
This PR ships only the provider-level HTTP wrapper and one error class.
It is feature-flag-free and does not change any user-visible behaviour
on its own — without later PRs, no caller invokes these methods.
## Linear
-
https://linear.app/chatwoot/issue/PLA-148/pr-2-meta-cloud-api-provider-methods
## What changed
- Add `Whatsapp::Providers::WhatsappCloudCallMethods`
(`enterprise/app/services/whatsapp/providers/whatsapp_cloud_call_methods.rb`)
wrapping six Meta endpoints:
- `pre_accept_call`, `accept_call`, `reject_call`, `terminate_call` —
`POST /{phone_id}/calls` with the relevant action payload.
- `send_call_permission_request` — `POST /{phone_id}/messages`
interactive `call_permission_request`.
- `initiate_call` — `POST /{phone_id}/calls` with `audio`/`offer`
session.
- Prepend the module into `Whatsapp::Providers::WhatsappCloudService`
only if defined, so OSS continues to work without the enterprise
overlay.
- Add `Voice::CallErrors::NoCallPermission`
(`enterprise/lib/voice/call_errors.rb`) — raised when Meta returns error
code `138006` from `initiate_call`. The remaining call-service errors
(`NotRinging`, `AlreadyAccepted`, `CallFailed`) will land with PR-4.
## How to test
There is no UI in this PR. Smoke-test from a Rails console with a
WhatsApp inbox configured for calling:
```ruby
inbox = Inbox.find(<id>)
svc = inbox.channel.provider_service
svc.respond_to?(:initiate_call) # => true
svc.respond_to?(:send_call_permission_request) # => true
# Optional live calls (require a real phone + Meta call-permission opt-in):
svc.send_call_permission_request('15551234567')
svc.initiate_call('15551234567', '<sdp_offer>')
```
Failure path: `initiate_call` against a contact who has not granted call
permission should raise `Voice::CallErrors::NoCallPermission` with
Meta's user-facing message.
