Payments

Because Backstage holds no reference to the actual entitlement of users internally we do not provide any solutions for payments on web platforms.

Any manner of payment outside of IAP needs to be handled directly by the application (or an integration of the 3rd party embedded in the application).

Cancelling

If the 3rd party integration has support for cancelling active subscriptions this can be facilitated through the Product Cancellation API.

danger

This should never be used for IAP cancellation, that always needs to happen from the store