To send data to our API, you need to send the following via HTTP POST: email, first_name, last_name and IP. Only the email is required, the rest are optional. You can send it in any programmatic way you want, as long as it hits our server via HTTP POST. To get the API URL, you need to select API as a Data Source and copy the API URL from Data Source/Integration in Notification Settings. You can send requests via PHP with curl or any other library, like GuzzleHTTP. See an example post here.