Hey there! When setting up Eno with Amazon, you would need to start at your Payment Options page in your Amazon account. From there, add a new payment method, then when prompted for your credit card number, Eno should pop up automatically asking if you'd like to create a virtual number for Amazon. Give that number a nickname and a new number should be generated. From there, just select that number when you check out and you should be all set! We hope this info helps!