There are 2 payment options
1. Credit Card
2. PayPal account
As part of the payment process you will be offered to choose either of these 2 options
In case you choose to use your credit card and the card is already linked to your PayPal account – the payment process will stop and you will be asked to provide a different credit card (which in not linked to any of your PayPal accounts).
In case the credit card you provided is not linked to the PayPal account, but you still get an error message - please wait few minutes and try again.