Discount Issues, very big problem

[mutahir-shah]

Hi I am web programmer , I am using your nice paypal package. I am getting one problem in discount.
The problem how to use a discount coupon code. I apply it manually the discount coupon code. But when adding the discounted amount it throws an error of difference in subtotal and total amount.
I am stuck here , please help me as soon as possible. How I use a coupon code discount.

Thanks.