Verify Android library
· Nexmo Verify enables you to verify whether one of your end users has access to a specific phone number by challenging them with a PIN code to enter into your application.
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 verify-4.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.