I use BluePay as my credit card processor and noticed recently that Shopsite added configuration for the BluePay payment processor directly. I switched to it from the modified Authorize.net file (anet.aa) I had been using. After configuration, I was able to process a test order. It correctly authorized the credit card. However, since it was only a test, I voided the authorization directly in BluePay instead of trying to bill (capture) the order.
Now receiving real orders I found that I could no longer bill orders in Shopsite. The Bill Order button was missing from the Manage Orders page, and pressing the Bill Orders button from the List Orders area just gave an error. I've gone back to my modified Authorize.net file since it works but am hoping that Shopsite can look into the BluePay configuration and fix it.