Forum (IPB) with roughly 20,000 members. We are attaching a multi vendor Marketplace (CS-Cart) on a sub folder.
What we need:
The ability for members and guests to sign up on either the CS cart Multi Vendor software or Invision Power forum software with their login details working on both. We also need the current members forum accounts to work in the Marketplace upon launch.
Customer signs up in Marketplace, purchases product. Customer decides they want to post in the forum, customer is already signed up and logged into the forum as they've already done so in the Marketplace.
Member of the forum visits new marketplace, no login required as they are already logged into the forum (or signed up on the forum)
A number of our members on the forum have signed in using their Facebook or Twitter account. As such their login details have been pulled each social network respectfully. We'd like to keep this feature on the forum intact as it's a popular method for logging in.