I Use PaymentExpress and I'm getting PxPay errors, should I use PxPost?
PaymentExpress provides two different account types, PxPay and PxPost. Shopify currently works with either method-- you will just need to specify which one to use under the "Accept Credit Cards" dropdown by choosing either "PaymentExpress" (which uses PxPost) or "Payment Express (PxPay)," which uses the PxPay method.
