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# Lessons of the trade : Handling CVV numbers
- URL: https://kudithipudi.org/lessons-of-the-trade-handling-cvv-numbers/
- Published: 2014-01-28T14:16:19.000Z
- Updated: 2014-01-28T14:16:19.000Z
- Description: Just for my notes.. Even though the CVV numbers on a credit card, look like numbers :), don’t treat them as integers in your code. Some...
- Author: admin
- Tags: Programming, security, Technology, Uncategorized, #wp, #wp-post, #Import 2026-08-23 02:32

Just for my notes.. Even though the CVV numbers on a credit card, look like numbers :), don’t treat them as integers in your code. Some of the numbers start with a 0.. so 059 might become 59 by the time you try to process it if you capture the CVV field as an integer.

Just treat them like a string.

And obviously you are not storing them anywhere in your application/network :). Or you might end up in the headlines like some of our [retailers](http://krebsonsecurity.com/tag/target-breach/?ref=kudithipudi.org).