There is a program that Bypasses it for non-server based games, like Hill Climb racing etc. So for example this won't work for Clash of Clans.
Program is called ''LuckyPatcher'' and it's very usefull if your device is rooted.
(nice trick is to just refund for a good reason and you get your money back, ingame money might stay)
As far as I know those are the only methods!
Good luck!