This page is a snapshot, kept by hand so it can be read without calling the API.
GET /emsp/v1/webhooks/event_types is the authoritative list, and returns the available versions for each type.Payload shapes
The table above says what each event means. For the exact fields, fetch the schema:api_version for that type and its payload JSON schema. Those schemas are served live — read them from the API rather than copying them into your code.
The envelope around data is identical for every event and is described on Webhook delivery.
Versioning
A subscription is pinned to oneapi_version, and that version’s payload will not change shape underneath you. A field being removed or retyped means a new version, published alongside the old one, which you migrate to when you’re ready.
Related
Webhook delivery
Verify signatures, respond correctly, and keep a subscription healthy.
Authentication
Get a token and the scopes needed to manage subscriptions.
Errors
The status codes the management endpoints return.