OAuth 2.0 Inbound Communication Configuration
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Prerequisites
- Concept X.509 Certificate Trust and Certificate Authorities The concept name is missing or undefined, and the provided source snippet is too truncated to extract sufficient grounded detail for a complete, accurate definition. A meaningful definition cannot be written without a valid concept name and adequate source content.
- Concept X.509 Client Certificate Lifecycle Management The concept name was not provided, so a precise definition cannot be generated. The available sources discuss topics related to **mTLS (Mutual TLS)** and **X.509 certificate-based authentication** with the [SAP Authorization and Trust Management Service](https://help.sap.com/docs/btp/sap-business-technology-platform/63fd9f1a140245df870dd7150ff15292?locale=en-US&state=PRODUCTION&version=Cloud) on SAP BTP. Developers use mTLS with X.509 certificates to implement secure, certificate-based token retrieval and service-to-service authentication, such as enhancing connectivity between services like SAP AI Core. [X.509 certificate parameters](https://help.sap.com/docs/btp/sap-business-technology-platform/436ed684eadc4045881e59bd1048d98d?locale=en-US&state=PRODUCTION&version=Cloud) can be managed directly by the SAP Authorization and Trust Management Service to support these secure communication patterns.
- Concept Public Key Infrastructure (PKI) and Certificates Mutual TLS (mTLS) is an authentication mechanism in which both the client and the server present X.509 certificates to verify each other's identity during a TLS handshake. Developers use it on [SAP Business Technology Platform](https://help.sap.com/docs/btp/sap-business-technology-platform/b2746795de5543aca2eefa9de2424256?locale=en-US&state=PRODUCTION&version=Cloud) to establish secure, certificate-based trust between services and applications, going beyond standard one-way TLS where only the server is authenticated.
- Concept Basic Authentication The concept name was not provided, but based on the sources, this appears to relate to **inbound communication authentication** in SAP BTP, ABAP environment. A Communication User is a technical user configured to enable inbound communication, allowing external clients to authenticate and connect to SAP BTP services. Developers use it alongside authentication methods such as [Basic Authentication](https://help.sap.com/docs/btp/sap-business-technology-platform/4e1761cecbdd47f6b93e1dfd9d254281?locale=en-US&state=PRODUCTION&version=Cloud) or OAuth to secure [inbound communication channels](https://help.sap.com/docs/btp/sap-business-technology-platform/7e73616a62e0455dab6574ead2073383?locale=en-US&state=PRODUCTION&version=Cloud). When using Basic Authentication, the client supplies the credentials of the Communication User to gain access to the system.