The card was declined because it was an invalid card number.

"No such issuer" means that the first six digits, Bank Identification Number, are incorrect and card was declined as a result.

We (Balanced) should be doing a better job to make this error more understandable or mask it by returning some invalid card number error.

Thanks for the reply. I still need to make a better job of displaying any general errors from Balanced that aren't for a specific input field.