The coupon information panel should be present after the Payment information, because it's impossible to press the continue button in the
coupon panel before you filled out the payment information.
When you then filled out the payment information you have to go back
to the coupon panel and click continue to once again come to the payment panel.
This is a bit confusing.
Then there are some errors to.
1) If you want to remove the coupon or change the coupon code (by clearing the coupon code field). the coupon code variable is not cleared because the discount is still calculated in the total.
2) The "Proceeed to checkout" label is not localized.
regards Berndt