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If a card payment fails, Stripe will retry to charge the card as per your subscription settings and email the customer. If a customer needs to update their card details, Stripe will include a link to your billing settings.
If all retries have failed, then the subscription is marked as
The default behaviour is to inform the user the next time they sign in and prompt them to create a new subscription or choose the free plan.
Strong Customer Authentication (SCA) is included with Gravity - you don't need to do anything to activate it.
When charging a European card, the customer's bank may ask for further verification. If this happens, a 3D secure pop-up will be displayed and the user can perform the validation in-app.
This will send an email to the customer to complete the verification. They will also be directed to the billing view the next time they log into your app and will see a message to check their email and verify the payment.