I think you are going to have to be more specific. There are thousands of BAPIs in the various ABAP based solutions. I hope you don't expect someone to describe them all to you. Why not start by runing transaction BAPI and seeing what is available in your system. At least you will need to describe what you are trying to do. Finally, this question isn't really directly related to Web Dynpro ABAP. There are no Web Dynpro ABAP specific aspects to finding the right business API to call. Perhaps a more detailed question in the ABAP general forum would be more appropriate.
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