How to change billing information on iOS/Android

If you run into a problem during checkout, it might be a good idea to update or change the payment method currently stored on your device.
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​🍏 iOS
When purchases are placed through iTunes, you can add a new card to your Apple ID directly on your iOS device.
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Add a payment method to your Apple Account
​Apple Support
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🤖 Android
Since purchases are placed through the Google Play Store, you can add a new card to your account directly on your Android mobile device. For more information, please refer to these resources:

How to add, remove, or edit your Google Play payment methods
​Google Play Support