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Visa starts its 16 digit string with "4" Mastercard starts with "5" Amex starts with "3" and only has 15 digits Discover starts with "6"
by fyresite 13y ago
Visa starts its 16 digit string with "4"
Mastercard starts with "5"
Amex starts with "3" and only has 15 digits
Discover starts with "6"