OS Commerce Work (Coupon Code / Paypal Fix)

Here's the issue: I have an online store that's up and running. Everything works great except my discount codes and coupon vouchers. We are using OSCommerce as our e-commerce platform. 1. Coupons/Vouchers - We can create, however they do NOT work. They won't register as valid at checkout and will not post to the subtotal. 2. Discount Codes - We can create, and they will work, but do NOT transfer to PayPal checkout. We need this issue resolved immediately.