Messages Read

This event occurs when a message has been read by the contact.

{
  "event": "messages_read",
  "timestamp" : "2016-10-06T13:42:48Z",
  "data" : {
    "channel": {
      "id": "6456078759331238786",
      "type": "facebook_messenger"
    },
    "contact": {
      "id": "6456078781510718339"
    },
    "last_read_timestamp": "2016-10-06T13:40:13Z"
  }
}
ParameterTypeDescription
data.channelobjectChannel where the data.contact resides in.
data.contactobjectContact that has read messages delivered.
last_read_timestampstringIso 8601 Timestamp

All messages that were sent before this timestamp were read. (It doesn't mean "time when the messages were read".)