Webhook Events

Receive real‑time updates when migrations, tasks, and login workflows change state.

Overview

Your Anon organization can subscribe to webhook events to receive push‑style notifications whenever important events occur during the data‑migration lifecycle.

Our webhook service gives you:

• High‑availability delivery with automatic retries
• A visual Event Log and Replay UI in the dashboard (/webhooks)
• Cryptographic signatures so you can verify that the payload really came from us

Typical use‑cases include:

• Kicking off downstream processing when a migration finishes
• Updating your own UI in real‑time as tasks progress
• Alerting when a login workflow is rejected or a migration fails

Quickstart

1. Navigate to dashboard.anon.com/webhooks and click + Add endpoint.
2. Enter the HTTPS URL (e.g. https://api.example.com/anon/webhooks) where you want to recieve events.
3. Click on Create. You’ll start receiving events immediately.

Testing

• You can create a Svix Play endpoint to test receiving events
• You can also send example events (svix.ping) through the Testing tab of your endpoint

Verifying requests

Each request includes seven headers:

accept · string

Indicates the MIME types that are acceptable for the response

content-length · number

The length of the request body in bytes

content-type · string

application/json

svix-id · string

Unique message ID (e.g. msg_2ycTlwDkllobhXwGILmiziO9xnz)

svix-signature · string

Cryptographic signature for verification (e.g. v1,cWXqN0eZ2edTtYgF+LfDDmNLgNOiSVx+OOq9WU3MDkw=)

svix-timestamp · number

Unix timestamp of when the webhook was sent (e.g. 1750133013)

user-agent · string

Identifies the webhook sender (e.g. Svix-Webhooks/1.66.0 (sender-9YMgn; +https://www.svix.com/http-sender/))

• You can copy the singing secret from the webhook page to verify the signature of webhook events
• You can set custom headers in the Advanced tab of your webhook

Event types

Migration Events

Event	Trigger
migration.created	A migration record is created and inserted into the database, but has not started yet
migration.started	The migration moves into WORKING, typically after login workflow success
migration.completed	The migration completes with status COMPLETE or COMPLETED_WITH_FAILURES
migration.failed	The migration enters FAILED

A migration_task.failed event may still result in available files for the corresponding task. We recommend polling the files API for partial extractions.

Payload format

All events share the same envelope:

{
  "id": "evt_01HX4J1SQ93Y9F6VBQ4JPZW66S",
  "object": "event",
  "created": 2025-06-18T00:50:40.301173,
  "type": "<event_type>",
  "data": {
    "migration_id": "mig_01HX4J3SQ4QZZ9V9JMP8J2V7KZ",
    "object": { /* resource object (see below) */ },
    "error_message": "Only present for *.failed events"
  }
}

Resource-based object schemas

Here are the schemas for different resource objects:

Migrations

{
  "company_id": "f7b2d4e9-3c8a-4f1b-9e6d-2a5c8b7f3e91",
  "created": "2025-06-18T04:06:42.453452",
  "id": "mig_01HX4J3SQ4QZZ9V9JMP8J2V7KZ",
  "created_by_user_id": "usr_01HX4J1SQ93Y9F6VBQ4JPZW66S",
  "object": "migration",
  "status": "NOT_STARTED"
}

Event Structure Example

{
  "id": "evt_01HX4J1SQ93Y9F6VBQ4JPZW66S",
  "object": "event",
  "created": 2025-06-18T00:50:40.301173,
  "type": "<event_type>",
  "data": {
    "migration_id": "mig_01HX4J3SQ4QZZ9V9JMP8J2V7KZ",
    "object": { /* resource object */ },
    "error_message": "Only present for *.failed events"
  }
}

Retry logic

• We retry with exponential back‑off (2 attempts).
• Return any 2xx status code to acknowledge delivery. You can see the history of events under Message Attempts in your webhook.