ListContacts

Keep field errors consistent by mapping Django Model field names to custom
DRF Serializer field names

{
    "uuid": "095be615-a8ad-4c33-8e9c-c7612fbf6c9f",
    "first_name": "string",
    "last_name": "string",
    "whatsapp_number": "string",
    "created": "2019-08-24T14:15:22.123Z"
}