Common Causes
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Incorrect Address - Such as using your school address instead of your home address.
Recommendation
Contact your financial institution and verify they have associated with your account. You may also want to ask about the failed transaction(s) and request the status of those funds.
International Cards
Some international credit cards will not work in our system if the billing information cannot be verified. We're told that's a possible reason for failed transactions.
Contact your financial institution for more information.