Can I use the cart on multiple sites?|
Yes, but there are considerations.
The cart cannot submit orders to more than one merchant/gateway account.
The cart can only display one way. In other words, you cannot set the cart to look differently if submitted to from a different site. This includes company name, colors, cart graphics, etc.
There is one exception to this, and that is Company Logo. You can specify the Company Logo image using Field 9: itemexempt (optional) of the "Add to Cart" button.