Other neat features: WS callbacks (aka webhooks) that notify you before a recurring payment happens, and after success/failure. Incremental billing support, s

Other neat features: WS callbacks (aka webhooks) that notify you before a recurring payment happens, and after success/failure. Incremental billing support, so you can e.g. tack on overage charges or small micro-charges to the next upcoming bill without needing a separate transaction for each one. Depending on your business model this could save you a lot of transaction fees.