paypal integration to group buying site with authorization

hi, like stated above paypal integration to group buying site is needed with inbuilt email system; the system is set up, but in between we moved the site to new server, so that might cause the loss of functionality; in admin panel, there is option to confirm the deal or decline it, which means paypal must work in a way, that when user buys, he gives us authorization to confirm the deal (if enough buyers) and decline (if not enough buyers) please bid, if you are familiar with paypal integration as described; [login to view URL] thank you