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Event: membership.changed

The plan of somebody who granted you the membership scope changed.

Payload

Field	Type	What it is
`id`	string	The event's id, the same as the Atheron-Event-Id header
`type`	string	`membership.changed`
`created`	string (ISO 8601)	When the event was raised
`client_id`	string	The client (test or live) it is about
`data.sub`	string	The person's ID for your app alone (pairwise): the sub your app was given.
`data.at`	string (ISO 8601)	When it changed.

json

{
  "id": "6f0c2e1a-8b0d-4f4e-9a51-2c1d7e9b3a10",
  "type": "membership.changed",
  "created": "2026-10-15T17:02:11.000Z",
  "client_id": "live-1a2b3c4d5e6f7a8b",
  "data": { "sub": "9a6d4c1e-1f0b-4a51-8a8e-3b2f6c0d7e11", "at": "2026-10-15T17:02:11.000Z" }
}

What to do

Call userinfo with a fresh access token to read the new plan. The event never carries the plan itself.

Checking it

Check the signature before you act on it (how), and answer 2xx within ten seconds.

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