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I'm currently securing a new website project where my client requires a forum that users must pay to access. I really want to use Vanilla but need someone to create a custom plugin for this premium option. Here's how I see the plugin working but you may a better idea.
If you've got Vanilla and PayPal development experience I'd love to hear from you. Reply here, or email Rimfya at Rimfya dot com, or twitter @rimfya