Build OData APIs in ECC using SAP Gateway (SEGW)| exposing BAPIs and Function Modules Develop CDS Views and RAP-based services in S4HANA Write optimized OO ABAP| OpenSQL| and SQLScript for high performance data access Configure and manage API security (OAuth2| SAML| Basic Auth) Monitor| debug| and troubleshoot integrations using Gateway and ADT Monitor| debug| tools Produce technical and API documentation