curl --request GET \
  --url 'https://api.example.com/api/v1/contact?api_key='

{
  "data": {
    "items": [
      {
        "first_name": "<string>",
        "last_name": "<string>",
        "email": "<string>",
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "created_at": "2023-11-07T05:31:56Z",
        "channels": {},
        "user_attributes": {},
        "last_seen": "2023-11-07T05:31:56Z",
        "last_sent": "2023-11-07T05:31:56Z",
        "org_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "first_assistant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "last_assistant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "first_widget_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "last_widget_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "custom_fields": {}
      }
    ],
    "total": 1,
    "page": 2,
    "size": 2,
    "pages": 1,
    "previous_page": 123,
    "next_page": 123
  },
  "message": "",
  "meta": {}
}