# What this PR does
Adds internal API endpoints for
`alert_receive_channels/<id>/webhooks/<webhook_id>`.
## Which issue(s) this PR fixes
Related to https://github.com/grafana/oncall-private/issues/2541
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
# What this PR does
Makes sure that all viewset actions with `detail=True` use
`self.get_object()` to retrieve an instance that's being acted upon.
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
