curl --request GET \
  --url https://api.vzaps.com/instances/{id}/user/contacts \
  --header 'Authorization: Bearer <token>'

{
  "code": 200,
  "success": true,
  "data": {
    "5511999999999@s.whatsapp.net": {
      "FirstName": "Maria",
      "FullName": "Maria Silva",
      "PushName": "Maria"
    }
  }
}