curl --request POST \
  --url https://api.example.com/api/v1/contacts \
  --header 'Content-Type: application/json' \
  --data '
{
  "phone_number": "<string>"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "phone_number": "<string>",
  "source": "<string>",
  "is_opted_out": true,
  "tags": [
    "<string>"
  ],
  "created_at": "<string>",
  "updated_at": "<string>",
  "name": "<string>",
  "email": "<string>",
  "whatsapp_name": "<string>",
  "profile_picture_url": "<string>",
  "custom_fields": {},
  "source_details": "<string>",
  "opted_out_at": "<string>",
  "last_message_at": "<string>"
}