curl --request GET \
  --url https://api.telli.com/v2/contacts \
  --header 'Authorization: Bearer <token>'

{
  "type": "<unknown>",
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "type": "<unknown>",
      "externalId": "<string>",
      "externalUrl": "<string>",
      "salutation": "<string>",
      "firstName": "<string>",
      "lastName": "<string>",
      "phoneNumber": "<string>",
      "timezoneIana": "<string>",
      "email": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "properties": [
        {
          "key": "<string>",
          "dataType": "string",
          "value": "<unknown>",
          "label": "<string>",
          "options": [
            {
              "value": "<string>",
              "label": "<string>",
              "description": "<string>"
            }
          ]
        }
      ]
    }
  ],
  "pageInfo": {
    "hasNextPage": true,
    "nextCursor": "<string>"
  },
  "meta": {
    "limit": 123,
    "count": 123
  }
}