Before buying, try the free version.
https://play.google.com/store/apps/details?id=ru.a402d.peripage.free

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Before buying, be sure to uninstall the free version.
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* UNISTALL FREE *
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Attention! The pro version differs only in the lack of notification on the printout. Speed, possible errors and print quality are the same in both versions. By paying a paid, you agree that the program is suitable for you as it is.

If a refund is issued you will lose access to the app.
After refund payment or installing from the unofficial application store, the text is printed out "invalid license"