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I am creating a WP multisite network similar to edublogs.org and I want the exact same signup page they have (preferably using gravity forms, same layout with edublogs, plus perhaps a little CSS tricks to match theme styling) to be created and integrated to WPMU's ProSites plugin. There is also a checkout page (again within the ProSites plugin) that needs to be integrated with Authorize.net (NOT available through the Prosites plugin) merchant account when the user decides to go pro after a trial period. An alternative to Authorize is Stripe (available through the Prosites plugin again).
I need TWO QUOTES for each option, one for authorize.net integration, one for stripe integration.