Scope: The main idea was to automate customer subscriptions management. SPN planned to use the Subscriptions Password Management feature in order to display the PayPal-generated username and password to the buyer during checkout. Also SPN wanted their customers to make additional payments in case they required a bandwidth upgrade.

Details: A PayPal Premier or Business account was needed to use PayPal subscriptions. Instant Payment Notification (IPN) functionality was used to automate subscription handling. During the checkout precedure the buyer was redirected to the secure PayPal page for  Authentication. Subscription terms were described before the buyer made initiial payment. When the payment was made the buyer received unique username and password which were generated by PayPal. At the same time the IPN system sent a notification to the SPN server to enable new subscription. The buyer returned to the SPN server, authorised there and started using the service.

In case the customer did not want to continue using the service for the next month he/she could go to the subscription management page at PayPal and cancel it. The IPN system notified the SPN servers immediately about this change so the subscription were cancelled at the end of the current term.

Some active users were downloading a lot of data through the SPN servers so they wanted to upgrade their initial bandwidth limit. It was possible to increase the bandwith limit by buying additional download credits. The IPN system helped track these transactions and update users' limits at the SPN servers.