Actually, this is not a "declined" transaction. It's a transaction where QB displays an error message and instructs the customer to try again later. It's as if QB is having a system problem (server down, etc). My customer has plenty of available credit and has made multiple payments over the past year, one being about a month ago. I'd like to know if people are having the same issue if they manually input the customer's credit card info within QB instead of the customer trying to pay it via the invoice link.