It would be nice if XenForo handled payments for user upgrades via a payment handler system. Like user upgrade payments are just a payment handler assigned to the user content type that do certain things upon payment receipt, something else for a refund, etc. And to be honest, I've already built the system (I don't use it for user upgrades, but everything else I do)... but it would be nice to have it as a core feature. So in my case, I have payment handlers for the following types of content (just to give an idea of how it works): threads (someone pays for something listed as a thread) Examples: https://forums.digitalpoint.com/threads/neat-clean-e-commerce-shop-with-paypal-checkout.2746611/ https://forums.digitalpoint.com/thr...y-logo-design-service-samples-inside.2744024/ marketplace_domains (someone pays for a site or domain for via Buy It Now or winning bidder) Examples: https://marketplace.digitalpoint.com/eyeonanime-com.259133/domain https://marketplace.digitalpoint.com/allcelebrityweddings-com.259085/domain marketplace_items (purchase of digital good) Examples: https://marketplace.digitalpoint.com/vbulletin-big-board-importer-vbulletin-3-vbulletin-4.1535/item https://marketplace.digitalpoint.com/mp3-music-script.895/item marketplace_articles (purchase of articles) Examples: https://marketplace.digitalpoint.com/how-to-build-trust-with-a-friend-or-family-member.775/article https://marketplace.digitalpoint.co...ess-instagram-guarantees-you-both.672/article advertising (advertiser funds their ad campaign with publisher) Examples: https://advertising.digitalpoint.com/advertiser?action=addsite It makes receiving payments really easy whenever you want to have any content type able to receive payments. For example, I could see it being super useful to just have a payment handler for resources. Then all you need to do is trigger a payment to a certain content type/content ID and then do whatever you want to do when PayPal's IPN sends you a notice of receipt. Transactions are stored in a central transaction table like so: ...anyway, like I said... it's something I've already built and it makes payment handling super easy and flexible whenever you want to accept payments for some different type of content. I'd be happy to donate my payment handler code, but it needs so much clean up, probably not even worth it. Either way, maybe an idea for XenForo 2.0 or something.