Confirmação de leitura

{
  "object": "whatsapp_business_account",
  "entry": [
    {
      "id": "WHATSAPP_BUSINESS_ACCOUNT_ID",
      "changes": [
        {
          "value": {
            "messaging_product": "whatsapp",
            "metadata": {
              "display_phone_number": "PHONE_NUMBER",
              "phone_number_id": "PHONE_NUMBER_ID"
            },
            "contacts": [
              {
                "profile": {
                  "name": "CONTACT_NAME"
                },
                "wa_id": "CONTACT_PHONE_NUMBER"
              }
            ],
            "messages": [
              {
                "from": "CONTACT_PHONE_NUMBER",
                "id": "wamid.ID",  // Este é o message_id que você precisa
                "timestamp": "TIMESTAMP",
                "text": {
                  "body": "MESSAGE_BODY"
                },
                "type": "text"
              }
            ]
          },
          "field": "messages"
        }
      ]
    }
  ]
}