This can happen for a variety of reasons. Typically, it’s due to our processor being unable to verify the information provided.
If you see an “Invalid Address” notification, it usually means something is amiss with your billing information. When you go to make a payment, please make sure to enter your billing address as it's exactly displayed on your bank statement. This should be the address your bank has on file and/or where your statements are sent. If you have moved recently, try both addresses, as sometimes banks are slow to update new addresses. Abbreviations can also cause this to happen, so note usages of “Street” vs. “St” or “Apt” vs. a number sign.
From a mismatch of name on the payment and the card, to a decline by the card issuer, to insufficient funds in the account, unauthorized payments happen. Sometimes, if a card is run too many times consecutively, the payment will automatically fail for the security of the payer. To prevent this, double check that you are correctly entering the card information or check in with your card issuer or bank before trying to pay again!