This is a common issue in brawl stars and needs to be fixed. In the brawl stars shop, it won’t let you buy anything and it says “ please enable in-app purchases in your device restriction settings.” To fix this , try downloading Brawl stars from the internet version of google play. ( make sure to use the same email you used in the google play app) Once, you log back in and log in to your supercell is created from the beginning, you should be able to purchase anything from the Brawl stars shop. ( Note that this only works on android phones with google play) Let me know if you have any questions regarding this problem in the comment section. Make sure to like and subscribe, but most importantly enjoy. :)