Boonex Dolphin with ZenCart, TCExam

I am creating a community website with Boonex Dolphin. Within Dolphin's environment, registered users need to be able to make purchases (handled by Zencart) in order to take tests on TCExam. I need my users to be able to move seamlessly through this process without having to repeatedly login. Therefore, Zencart and TCExam need to be installed and configured to access Dolphin's database. It is through this process that a user moves up to a higher membership group, so this process may need to be repeated by the same user several times over the time that they are a member of the site. I plan on installing the "clean" version of Dolphin (which is absent the Orca forum and Ray multimedia package) so that I can run PHPBB instead of Orca. In a similar manner to the above, PHPBB needs to be installed and configured to access Dolphin's database so that users can seamlessly use the forum without having to login multiple times. For a given user, it is important that the PHPBB post count and that the length of time of their membership at a given level be tracked, since they are not to be able to access the next membership level (part of the shopping cart) until certain requirements are met (unique per membership level.)