Hi

I've spent a day and a half trying to get checkout by amazon to work on my 1.5.0 cart. I have made much headway. Regarding the call back functions for shipping and tax. If I have callbacks enabled I get the error numerous folks have reported.


We're sorry!

We're sorry, but we're currently having problems retrieving order details from the merchant, and cannot process your order. Please return to the merchant's website and try placing your order again.


Can anyone tell me if it is curl that handles the callback function? I think it is but I'm not certain.