Xsolla Payments SDK for Android
· Xsolla Payments SDK for Android allows partners to monetize their product by providing users with a convenient UI to pay for in-game purchases in the game store
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window payments-1.0.6.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.