On 4.5.0 I an getting the following internal error when I try to complete an order.
Order processing error
Order declined.
Review your data or contact the store administrator.
Reason: Internal error (The merchantEmail field is missing or incorrect)
In the order details page, I have the following error
--- Advanced info ---
Reason: Internal error (The merchantEmail field is missing or incorrect)
CVV info: not set /
Edit********************************************** ********************************
After some digging around, I found that a mod on the forums was causing the error message.
Add to Cart Alert.
The address feild has to be
xxxx@xxxxx.com and can not be The Store <
xxxxx@xxxxxx.com>