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Endpoint

PUT /contacts/:contact_id/topics/:topic_id

​
Request body

{
  "is_subscribed": true
}

​
Response

{
  "data": {
    "id": "0df0fc92-89f2-4f23-a9e6-e9da2f3c1685",
    "contact_id": "c671f89b-3ec1-4c58-9ad2-4ef8c2917cda",
    "topic_id": "8c3c4d0e-f7f3-4d7f-92ae-b1498f6a2fa9",
    "is_subscribed": true,
    "subscribed_at": "2026-06-08T15:12:00.000Z",
    "unsubscribed_at": null
  }
}
Successful updates also emit sendrealm.topic.subscribed or sendrealm.topic.unsubscribed.