What payment gateway are you using?
If you are using PayPal Payments standard, I suggest changing to the PayPal Express checkout payment gateway. The PayPal standard gateway has been deprecated in Cafe Commerce.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.