You can change or add a payment method by following these instructions:
Apple
On the Home screen, tap 'Settings' โ๏ธ
Tap iTunes & App Store.
Tap your Apple ID. (You might need to sign in with your Apple ID.)
Tap View Apple ID.
Tap Payment Information.
Change your information and tap Done.
On your Android device, open the Google Play Store
Tap the profile icon in the top right-hand corner of the screen
Tap Payments and subscriptions
Tap Subscriptions
Tap on Circuit Route Planner
Next to Primary payment method, tap Update
Follow the on-screen instructions to update your payment method.