Interface programming in SAP ABAP offers a straightforward path into the world of ABAP interfaces. This book introduces readers to all relevant classic technologies for system-to-system communication using ABAP, including synchronous and asynchronous techniques. Learn how to leverage the RFC protocol to create applications and gain an understanding of how it serves as a foundation for modern interfaces, such as Web Services in ABAP. Learn how to create an RFC in three minutes and walk through a detailed example. Dive into creating and using BAPIs, IDocs, and ALE. Explore important aspects of using function modules in SAP S/4HANA. Get an overview of SAP Connectors. - Overview of classic SAP ABAP interface techniques - Remote Function Call (RFC) and BAPIs - IDoc and ALE - Using Remote Function Module (RFM) und BAPIs in SAP S/4HANA