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I have just begun setting up Moz Analytics for some of my clients. It lets me add 5 client's sites to a single account but I can't find anywhere to create an additional user/login for a specific account that way I can give access to each client only to their campaign.

Is this not possible and if not something you plan on integrating in the near future?

Just to give you something to gauge how expensive their prices are. Setting up a single goal in Google Analytics shouldn't take any more than 30-60 minutes assuming the goal is using existing pages.