"How do I use Digital Dollars?
Occasionally, we offer promotional online coupons such as Digital Dollars--a form of discount you can use towards online purchases.
It's easy to use new Digital Dollars for your online purchases. Enter the provided promotional codes provided via email either when you sign in to Your Account or during the checkout process.
You must have an account and a valid credit card to redeem Digital Dollars. Your credit card will be charged only if the total amount of your purchase exceeds the total value of your Digital Dollars, however you must enter your credit card during the checkout process.
If you have saved Digital Dollars into Your Account, these credits will automatically be applied to your order, up to the total purchase amount. Keep in mind that Digital Dollars are one-time use only and cannot be applied toward future purchases."
...sounds like they used the random excuse dart board to come up with that one