The first digit of the number is the Major Industry Identifier. 1/2 are for airlines, 3 is for travel/entertainment, 4/5 for banking and financial, 6 for merchandizing and financial, 7 for petroleum, 8 for telecommunications. 0 and 9 are for other assignments but you’ll likely never see them. If you look at an American Express card, you’ll see it starts with a 3, a throwback to their travel/entertainment roots.Aldus een van de
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