I have two problems:

1. Discount coupon is not applying to the cart total. It tells me that the discount coupon has been redeemed, but it does not change the cart total, even after clicking on continue checkout.

Details of the coupon:

Coupon Zone Restriction: 0
Coupon Name WELCOME
Coupon Description
(Customer can see) Welcome to my site.
Coupon Amount 5.0000
Coupon Minimum Order 10.0000
Free Shipping No Free Shipping
Coupon Code WELCOME
Uses per Coupon
Uses per Customer 1
Start Date 03/08/2010
End Date 03/31/2011

2. Gift voucher is redeemed and applied to the shopping cart, but the payment gateway still gets the invoice total without deducting the gift voucher value. The shopping cart shows the correct amount, but does not seem to communicate this with the gateway - I'm using Monsterpay (Setcom). I found a solution for Paypal in the threads, but the same coding is not in the setcom.php file.