Postbacks

{
  "object": "instagram",
  "entry": [
    {
      "id": "17841400000000001",
      "time": 1793200000000,
      "messaging": [
        {
          "sender": { "id": "1000000000000001" },
          "recipient": { "id": "17841400000000001" },
          "timestamp": 1793199998000,
          "postback": {
            "mid": "aWdfZAG1faXRlbTo...",
            "title": "Quero assinar",
            "payload": "ASSINAR_PRO"
          }
        }
      ]
    }
  ]
}