SubscriptionJS.finalize(success, error)

For interactive PSPs like PayPal this needs to be executed on the return page the PSP redirects to after finishing a payment. It triggers finalizing the order in billwerk. The success and error callback can inform the customer if the order succeeded or not.

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Please note that you must never rely on the finalize page is ever called during the order process, e.g. a customer could close the browser after successful payment or something else happens. Always use our webhooks to be notified a subscription was successful.