I suspect that the modifyorderbutton and modifyamountbutton examples in this repository are obsolete. As far as I can gather, adding buttons to the pay activity is no longer allowed except in the case of custom tender apps. In any case, these examples no longer build in current versions of Android Studio due to the very old version of Gradle that they require. They should probably be removed to avoid confusion.
i would need little advice in implementing backend system in Java, if you have bit of time. I searched most of Java examples available on clover github, but all of them are connected to hardware POS device and Android. Is there any good example that is not connected to hardware POS device or Android (just backend communicating with clover- ordering items and making payments).
If i am correct, data model classes are available only android sdk?