### Subscription topics vs. event `type`
Integrators subscribe to one or more **topics**. Each topic governs which
`type` values a given webhook endpoint may receive:
| Topic | Delivers `type` values |
|  --- | --- |
| `REQUEST_STATUS` | `STATUS_UPDATE`, `STATUS_UPDATE_ACTOR`, `STATUS_UPDATE_STEP` |
| `REQUEST_LIFECYCLE` | `STATUS_UPDATE` (on draft/create transitions), `REQUEST_FINALIZED` |
| `IDENTIFICATION_UPDATE` | `IDENTIFICATION_OPERATOR_CHECK_UPDATE`, `IDENTIFICATION_DOCUMENTS_UPDATE`, `IDENTIFICATION_BIOMETRY_UPDATE` |
| `REQUEST_AUTHENTICATION` | `REQUEST_AUTHENTICATION` |
| `AUTOMATIC_RETRY` | `AUTOMATIC_RETRY_TRIGGERED` (opt-in) |