If your credit or debit card is being rejected by PayPal with the message "The card you entered cannot be used for this payment. Please enter a different credit or debit card number." it could be caused by one of the following problems:
If you can't use a different credit and debit card, you could also try to add a new bank account as a funding source to an existing or new PayPal account.
If you still can't make a payment just choose the credit or debit card option at checkout and your payment will be completed with another payment provider.