Does anyone know or have had success using any other United States based payment gateway other than Paypal or GoogleCheckout? The dropdown options are Paypal, Google, and Other. Can “other” be the likes of a true gateway that allows the option of merchant processors, like Authorize.net, eProcessingNetwork.com or USAePay.com or other such gateways? Any experience or feedback you have with this is appreciated ASAP as our project is in a holding pattern based on this. Thanks!