The pre-paid Visa card is just like any other Visa debit card and can be refused by merchants for a number of reasons. First, make sure to check that your card still has a sufficient balance. Next, double check that you added the correct card number, name, and address details while making the transaction. If you're still running into problems using the card, please email Fondue with all the details of your charge at card@getfondue.com and they'll be happy to help!