Obviously, the simplest solution would be for the client to share their account details or add us as ‘team admin’, but that is not what this is about.
- Add us to your iOS Developer Program as ‘team member’.
- Create a ‘Distribution Certificate’, if you haven’t got one already.
- Create a ‘App Store Distribution Provisioning Profile’.
- Export the ‘Distribution Certificate’ assets and send the export and password to us. (For security sake, it’s a good idea to send us the password via other means than the exported certificate. E.g. by phone/SMS.)