You cannot use PayPal on amazon directly, But the answer to your question that
I can use PayPal on amazon via the PayPal key is YES. It is referred to as payment done electronically by PayPal. When using the PayPal key payment option, you can process payments using the funds in your PayPal account or a linked debit card or credit card. Same as MasterCard this could also be used anywhere across the globe and at any time. Now the question is how to use it; you just need a few things. First your PayPal key number, and second is your SSN. Third is the expiry date.
