In one-time pricing models (pay-as-you-go principle), one-time payments are made. In return, the purchased product can be used indefinitely until the end of the product life cycle. If the product or service is needed again, the payment process must be restarted. In contrast, in the case of subscription payments, customers authorize the retailer to automatically debit sums of money from their accounts at regular intervals. With such recurring payments, the product can be used until the customer revokes their permission or the subscription expires.