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2. collision - Algorithm for Gift Card Codes - Stack Overflow

   stackoverflow.com/questions/2086983

   1. Based on Jason Orendoff's answer, I put together an algorithm to generate gift card codes. Basically, it has two 40-bit numbers: one of them to assure it is unique and another to assure it is hard to guess. the 40-bit random number part is enough for 1 in 2^40 chances of guessing;

3. java - Generating and securing gift card codes - Stack Overflow

   stackoverflow.com/questions/49627301

   If there is a balance left on the gift card, a new gift card code is generated (user is sent a new link to get their new gift card code for the balance) When the online store is billing us, they provide us with a list of payment I.D.'s, which we then match to gift card codes in our backend (then matched to our issuer). Protects:

4. how to generate a voucher code in c#? - Stack Overflow

   stackoverflow.com/questions/4713584

   I need to generate a voucher code[ 5 to 10 digit] for one time use only. what is the best way to generate and check if been used? edited: I would prefer alpha-numeric characters - amazon like gift

5. Django/Python generate and unique Gift-card-code from UUID

   stackoverflow.com/questions/64894070

   Now I need to found a way to generate this gift code. Obviously this code most be unique. I found this article where the author suggest to use the auto-generaed id (integer id) into the generate code (for example at the end of a random string). I'm not sure for this because I have only 10 characters: for long id basically I will fire some of ...

6. Python - How to always generate valid Luhn numbers?

   stackoverflow.com/questions/59232327

   This is my code to validate the numbers using Luhn algorithm (if you have any suggetion to improve it, like use a better list comprehension, let me know): def valid_luhn(cc): num = list(map(int, str(cc))) return sum(num[::-2] + [sum(divmod(d * 2, 10)) for d in num[-2::-2]]) % 10 == 0. python. algorithm. generate. luhn.

7. Calculate CVV from Credit card tracks? - Stack Overflow

   stackoverflow.com/questions/34456127

   2. You need two DES keys (CVK's), card no, service code, expiry to generate CVV. CVV = Fun(CVK1, CVK2, card_no, service_code, expiry_YYMM); There are three CVV's. CVV1 : in magnetic stripe. CVV2 : back of card. ICVD : in chip data. Service Code for each CVV differs.

8. How to generate a verification code/number? - Stack Overflow

   stackoverflow.com/questions/46231

   If all you want is a verification number then just use a sequence number (assuming you have a single point of generation). That way you know you are not getting duplicates. Then you prefix the sequence with a CRC-16 of that sequence number AND some private key. You can use anything for the private key, as long as you keep it private.

9. Generate google play gift card code automatically

   stackoverflow.com/questions/43417046

   The process phases: User requests to redeem points as google gift card. My server get this request and generates a gift card code. Gift card code is sent back to the user mail. android. edited Apr 15, 2017 at 0:42. Tim Baggins.

10. Scratch card number & serial generator - Stack Overflow

    stackoverflow.com/questions/10987302

    2. Scratch card number and Serial number are independent of each other. They are just for proving the authentication of the scratch card.At the server end both serial number and scratch card number are matched and if they get matched then only further operation/activity takes place. Scratch Card number is generated by Random Number Generation algo.

11. magnetic cards - Amex track data format - Stack Overflow

    stackoverflow.com/questions/23062225

    Example: Standard Track: 374245455400001=131210112011234500000 – Service code is 101. Track with no service code: 374245455400001=1412120112345 - So in this case 120 is incorrectly interpreted as the service code whereas it forms part of the Discretionary data. Thanks. magnetic-cards. credit-card-track-data. edited Nov 1, 2015 at 11:46. Jongware.