Hi, I have an upcoming addon called XenAuction, which as the name implies adds auctioning functionality to XenForo. Currently the addon is in it's final stage but has no payment integration. I plan to integrate it with paypal but am trying to figure out the best way of implementing this. I'd like to know from people interested in using this addon what method of payment they would prefer? Here are a couple of options: A - Completely manual, allow users to configure a message that details payment instructions - the auctioning addon does not facilitate the payment process itself Problems with this method: The addon has no way of tracking completion status, users will need to manually update their auctions. Users will need to come up with their own payment solutions, which might be preferable by some but for many this can be a deal breaker. Forums can't charge a percentage of the earnings. You can end up with buyers that don't actually make their final payment. B - Pre-charged "wallet" system, users will need to charge their account before they are able to place bids or buyouts. When they loose an auction the funds will be refunded to their forum wallet account. Problems with his method: Users can end up with funds on their account without having a way of spending it on something they want. C - Process payment upon winning an auction Problems with this method: You can end up with buyers that don't actually make their final payment. Option B can be more viable if a method was implemented where users could "withdraw" funds. Option C can be more viable if a rating system was implemented where you have buyer and seller rating and sellers were able to set a minimum seller rating. Personally I'm in favour of option B right now, but it's also the most complicated to implement. What are your opinions? (feel free to add an option of your own ).