Exploring the Architecture of the SAP Digital Payments Add-On

The SAP digital payments add-on is a cloud-based middleware component hosted on SAP BTP. Its primary role is to act as a centralized payment hub that decouples business applications—SAP or non-SAP—from the complexity of integrating with multiple PSPs. By serving as this central hub, the add-on unifies communication protocols and manages a broad range of payment activities, including sales order authorization, settlement, invoice and refund handling, payment advice reconciliation, and pay-by-link scenarios. The result is a single, secure gateway (see figure below) through which all digital payment transactions that touch your SAP landscape are processed and monitored. At its core, the architecture positions the add-on service between consumer applications—such as SAP ERP, SAP S/4HANA, SAP Subscription Billing, or other, non-SAP solutions on the one hand, and external PSPs like Stripe, PayPal, SnapPay, Worldpay B2B Payments, and the like on the other. This layered arrangement delivers the key advantage of the add-on: Business applications interact through a single, consistent API interface, while the add-on handles the individual PSP integrations and routing logic behind the scenes. ...