We've had a handful of new users win their first auction this week and promptly send payment directly to RBA. Please do not do this. While we appreciate your enthusiasm, we don't handle anything related to the transactions between seller and buyer. We simply provide the platform.
When you win an auction, the seller will forward you an invoice, typically within 24 hours. They should message you with their PayPal information, if they're not using direct payment. If not, or if you have general questions, you may contact the seller via the green "Message Board" link on your "Items I've Won" page.
Thanks.