curl --request POST \
  --url https://api.keebai.com/v1/messages/contacts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "+5491155555555",
  "phone_number_id": "100000000000001",
  "contacts": [
    {
      "name": {
        "formatted_name": "<string>",
        "first_name": "<string>",
        "last_name": "<string>"
      },
      "phones": [
        {
          "phone": "<string>",
          "type": "<string>",
          "wa_id": "<string>"
        }
      ],
      "org": {},
      "emails": [
        "<string>"
      ],
      "urls": [
        "<string>"
      ],
      "birthday": "<string>"
    }
  ],
  "meta_data": {}
}
'

{
  "message_id": "<string>",
  "status": "sent",
  "sent_at": "<string>"
}