Depends on your requirements/scenario/landscape.
Is it A2A? B2B? SAP to non-SAP? non-SAP to SAP? SAP to SAP? non-SAP to non-SAP? Abap Proxy?
Also, take into account which adapters to use?
Idoc, File, Soap, HTTP, RFC, JDBC...
Obviously you draw up the requirements first, create a technical and functional specification and then develop the interface accordingly.
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