Lucky Patcher is a free Android app developed by ChelpuS that can emulate in-app purchases to get them for free in many apps and games, block ads, remove unwanted system apps, backup apps before and after modifying, move apps to SD card, remove license verification from paid apps and games, etc.

Lucky Patcher is a useful Android tool to emulate in-app purchases to get them for free in many apps and games, remove ads, disable unwanted permissions, bypass license verification in premium/paid applications, and more.
To use all features of Lucky Patcher, you need a rooted device.
You can perform some functions with root such as patches to Android system and installing the modded Play Store, which can emulate purchases across the entire device without needing to individually patch each app. With it you can also purchase paid apps and then refund them, keeping the app installed.
Note:
Although stable, functioning of Lucky Patcher can't be guaranteed at 100%.
So you are solely responsible of use of this application.