Services like PayPal Key and the PayPal Debit Card are primarily available to US customers.
Log in to your PayPal account and look for the "PayPal Key" option to generate a virtual card number. how to buy stuff on amazon with paypal
If you don't want to apply for a card, you can use your PayPal account to buy Amazon Gift Cards from third-party retailers. Services like PayPal Key and the PayPal Debit