Sorry, I have used this service(www.cashU.com) before. And I am not sure if this service can act as a real credit card.

In my situation, I have a credit card from local bank.

Then I use this credit card to create a paypal a/c. If you are a seller, the credit card is used by paypal for charging fee and verify your personal info.

For payment received from paypal, you need to enter one of you local bank a/c for withdrawing your money. However, make sure your currency is accepted by Paypal.