vgscheckout
· VGS Checkout Android SDK is a library that allows you to securely collect payment and billing data from your users without having to pass that data through your systems. Get all the benefits with pre-build form while having flexibility with customizable UI components on mobile devices with Android OS.
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 vgscheckout-1.3.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.