curl --request GET \
  --url https://app.fliqr.ai/api/users/find_by_custom_field \
  --header 'X-ACCESS-TOKEN: <api-key>'

{
  "data": [
    {
      "id": 123,
      "page_id": 123,
      "first_name": "<string>",
      "last_name": "<string>",
      "channel": 123,
      "profile_pic": "<string>",
      "locale": "<string>",
      "gender": 123,
      "timezone": 123,
      "last_sent": 123,
      "last_delivered": 123,
      "last_seen": 123,
      "last_interaction": 123,
      "subscribed_date": "<string>",
      "subscribed": 123,
      "tags": [
        {
          "id": 123,
          "name": "<string>"
        }
      ],
      "custom_fields": [
        {
          "id": 123,
          "type": 123,
          "value": "<string>"
        }
      ]
    }
  ]
}