Visa starts its 16 digit string with "4" Mastercard starts with "5" Amex starts ... | Hacker News

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fyresite on April 1, 2014 | parent | context | favorite | on: How to Correctly Detect Credit Card Type

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"

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