You may use the Digistore24 ipn system for managing subscription and rebilling on your plattform - e.g. on your membership area.Handling product accessUse these events to handle access to your product:on_payment grants access to your producton_payment_missed revokes access to your productCreating accountsThese parameters (and other) are sent asipn dataemailaddress_first_nameaddress_last_nameCreate an account for these user data.If you wan to pass user data to Digistore, please see this article.Accounts and ordersWhen implementing your platform, please be aware, that a buyer may have multiple products.It's essential, that you store the Digistore24 order id and track the order status for each order id.Example:StepActionChangeEvent1buyer buys product Aorder id AA11AA11 createdon_payment sent for order AA11AA112buyer buys product Border id BB22BB22 createdon_payment sent for order BB22BB223buyer cancels AA11AA11rebilling stopped for AA11AA11on_payment_missed sent for AA11AA11If you would implement product access on an account level, the buyer may end up without product access after step 3.Please implement product access on an order level, so that a buyer may have multiple orderes.UpgradesFor upgrades and downgrades, the on_payment_missed event is not sent.Access to the new product should be granted at a certain date.For upgrade and downgrades, Digistore24 passes these ipn parameters:Parameter nameTypeDescriptionExample valueupgraded_order_idstring(15)ID of the “upgraded” order, i.e. the order ID the buyer has purchased the upgrade for.1A2B3C4Edelivery_datedateThe date, when the new product should be delivered and access to the previous (upgraded) product should be stopped. If empty, access to the new product should be granted immediately.(empty) or 2014-03-12Revoke access to the product of previous order (upgraded_order_id) on given date (delivery_date).At the same time grant access to new order (order_id).