By purchasing The Tapping Solution App via Apple iTunes you can easily manage your billing and payment details online by following the instructions here.
For purchases made through Google Play, you can change your automatic payment method by:
- Signing in to Subscriptions.
- Find the subscription you want to edit and click Manage.
- Under the card, you’re currently using to pay, click Change payment method. If you don’t see this option, click Manage payment methods.
- Choose a payment method.
- Choose Submit.
You can learn more about how to manage your Google Play app subscriptions in the article here.