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No, you don’t have to pay for it again.
The ownership of a paid G-Stomper app is bound to the Google Play account which you have used to buy it. If you want to install a paid G-Stomper app on another device (when switching to a new phone for example), simply attach the same Google Play account (the one you have used to buy G-Stomper) to the new device. Once this is done, you can download the app without getting charged again.
If you still see the “Buy” button on Google Play, go to …
Settings > Apps > All > Google Play Store > clear cache and data Finally reboot your device and then try again.