What an API management strategy has to decide
An API management strategy is a set of decisions that stay valid when systems, teams and projects change. For SAP S/4HANA and SAP BTP it must answer six questions: which interfaces are exposed as managed APIs, which interactions should be events instead, where policies are enforced, who owns each API through its lifecycle, how consumers are onboarded, and how everything is monitored and supported.
Without those answers the usual pattern appears. Each project exposes SAP data in its own way, credentials are passed around informally, nobody knows who calls what, and a change in SAP S/4HANA breaks a consumer that nobody knew existed. A strategy replaces this with a short list of rules that every team follows.
This guide is written for three readers. The CIO needs to know what to fund and which risk it removes. The integration architect needs the building blocks and the decision points. The head of the SAP centre of excellence needs an operating model that a real team can run.
The building blocks on SAP BTP
API Management
API Management is now offered only as a capability within SAP Integration Suite. Plan it as part of that suite, next to Cloud Integration, Integration Advisor, Trading Partner Management and the other capabilities, not as a separate product with its own roadmap.
Its core objects are API proxies, policies, products, the API developer portal and analytics. A proxy is the managed front door to a backend service. Policies enforce behaviour on every call, for example OAuth 2.0 verification, quota and spike arrest, and JSON and XML threat protection. Products group APIs for a defined consumer audience. The developer portal is where consumers find and learn about APIs. Analytics shows how the APIs are used.
Cloud Integration
Cloud Integration runs integration flows. Use it when a call needs more than exposure: mapping, routing, orchestration across several systems, or protocol conversion. A common pattern is an API proxy in front, an integration flow behind it, and the backend behind that. The proxy decides who may call and how much. The flow decides what happens next.
