Master-code is 10-digit digital code generated by the system for you during the registration process. It is required for first-time login to the system via voice interface, or during the first launch of the WM Keeper Mobile program. You shoud write down the master-code on a piece of paper and keep it in a safe place, as its loss is equal to loosing your account in the system.
To restore your master-code choose "Restore" option in the first window that appears after launching WM Keeper Mobile.
Please note that your master-code differs from WM Keeper Mobile password which is specified by users themselves.