Thanks @robnotyou. So to summarize and clarify: for client that gave me access to the developer.apple.com - I can set it up for him and invite myself to developer team with permissions. That will allow me to use that team in the xcode and archive the app and send it to testflight for example. there after testing, we would move it to Appstore and that's it. for client that wants to do it himself - i don't want to complicate it for them by sending the code (they dont have xcode etc). Can i archive the app and prepare a file (.ipa?) and send that to them ?