Do you want to purchase my app? I want to help you do that.
If using Google Play, ensure it is up to date and verify your payment method. Also see Google Play help pages on purchasing.
If using Amazon, verify your payment method and see their help page on payment issues.
If the above fails, you can directly purchase a license:
If the app does not unlock automatically, send a photo or screenshot of the app’s settings > help screen to [email protected] so I can assign your purchase.
Thank you.