First of all, thank you for supporting us with an in-app purchase! 🙌  

We are sorry to hear that you are experiencing issues with in-app purchases. First of all, please make sure that your device doesn’t have in-app purchases disabled. 

All of the purchases are handled by the store, so in case of error, you should contact the dedicated store support. 

Google support:
https://support.google.com/googleplay/gethelp

Apple support:
https://support.apple.com/billing

Steam support:
https://help.steampowered.com/en/wizard/HelpWithPurchase