curl --request GET \
  --url https://api.cleartalk.ai/contacts \
  --header 'x-api-key: <api-key>'

[
  {
    "id": 123,
    "userId": 123,
    "listName": "<string>",
    "tag": "<string>",
    "firstName": "<string>",
    "lastName": "<string>",
    "email": "<string>",
    "phone": "<string>",
    "dateOfBirth": "<string>",
    "contactSource": "<string>",
    "clearTalkNotes": "<string>",
    "customField": {},
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
]