The sample app (SA) is a completed Issuer Pay app that can be used to simplify the process of integrating the MTP SDK into the mobile application easier.
The Sample app enables developers to see the big picture of how the functionality of the MTP should be implemented. We strongly recommend actively using the Sample app in the development process to save both time and effort. It is important to note that the Sample app is not a one size fits all solution as your individual application might have different setup or prerequisites. However, using the Sample app in the development will help you achieve a better implementation much faster.
Github repository: Sample Application.