At the end of checkout you can choose the payment you prefer:
~ with paypal you can choose to use the payment methods you have stored in your paypal account, or if you do not have an account you can use a credit card always using their service for non-subscribers;
~ with Amazon Pay you will be able to use your Amazon account and the payment methods you have stored in it.
In both options, you will still be redirected to the respective platforms, which already manage your payment data, and none of your payment data (username, password, card data, etc.) will be displayed, stored or saved on our servers.