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Its a sinvle digit on the front of the card. 1-9. Some bank cards don't use issue numbers such as RBS so if you are trying to pay for something online and they are asking for it just leave it blank if your card doesn't have one.
There isn't one on visa debit cards I've just been looking for half an hour and found out that not all cards have them so i just left the box blank when using my card but i also heard that if you don't have one you should use the number 0 but if possible i would just leave it blank xxx
One possible answer: Blank 1 = 3150 Blank 2 = 10 Blank 3 = (2/315) = approx 0.006349
7 times blank = 2 times blank
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