Yes an SAP solution has its specific sets of BAPIs. BAPIs are the methods of the so called Business Objects (not to confuse with ABAP Objects classes). You can browse the Business Objects (BOR) with the transaction BAPI. The real information you need, (when to use which, etc....) is part of the application's documentation.
Technically the BAPIs are function modules with several special properties, for example their names start with BAPI_... so you can also see them in the function module editor (se37) idf you select all this prefix.
Dirk
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