I have had checks denied so far at three different locations due to the poor business / check processing procedures of Certegy. The last time was at Walmart. I used my credit union account and my check was denied. I then tried my 'regular' bank account check, and it was denied. Finally I used my debt card which pulls from the same account as my bank account, and the purchase went through. Clearly this was not an issue of sufficient funds, as the debt card was authorized but the checks were not. And it was embarrassing. I made... read full review »