Red exclamation with error codes 12849 and 12850...credit card payment and maintenance fee not going through
I can provide a bunch of solutions to help you resolve the error codes.
I take it that you're processing your customer's payment in QuickBooks Online or in Merchant Services This is likely caused by the credit card itself. In this case, you'll want to check the card's information to see if it's correct.
Another thing to do is to let the customer check with their bank to see if they have enough credit card limit or funds to make the payment. Alternatively, they can use another form of payment method to process the transaction.