S2S API allows you to send data to the MyTracker server. With this API, you can upload any events (for example, user authorization, payments, deliveries, etc.) Uploaded events is added to the project data and displayed in MyTracker reports.
To access API:
You can use open source library PHP SDK that making integration easy. Also, you can add the mytracker/s2s-api library as dependency if you use Composer.