messaging_handovers Webhook Event Reference

{
   "sender":{
      "id":"<PSID>"
   },
   "recipient":{
      "id":"<PAGE_ID>"
   },
   "timestamp":1458692752478,
   "pass_thread_control":{
      "previous_owner_app_id":"<previous_app_id or null (idle_mode)>",
      "new_owner_app_id":"123456789",
      "metadata":"Additional content that the caller wants to set"
   }
}

{
  "sender":{
    "id":"<PSID>"
  },
  "recipient":{
    "id":"<PAGE_ID>"
  },
  "timestamp":1458692752478,
  "take_thread_control":{
    "previous_owner_app_id":"123456789", //could be null if thread was in idle mode
    "new_owner_app_id": <new_app_id>,
    "metadata":"additional content that the caller wants to set"
  }
}

{
  "sender":{
    "id":"<USER_ID>"
  },
  "recipient":{
    "id":"<PSID>"
  },
  "timestamp":1458692752478,
  "request_thread_control":{
    "requested_owner_app_id":123456789,
    "metadata":"additional content that the caller wants to set"
  }
}

{
  "recipient":{
    "id":"<PSID>"
  },
  "timestamp":1458692752478,
  "app_roles":{
    "123456789":["primary_receiver"]
  }
}