Luhn Algorithm Test: How the Mod 10 Check Works
Run a Luhn algorithm test by hand: double every second digit from the right, sum the digits, and pass the number when the total divides by 10.
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Onyx Gift Cards is a Grenadian company designed to introduce, market and manage gift cards systems in Grenada for retailers and corporations. We are enthusiastic about the effect and influence we will have on the local market. We intend to expand our systems regionally with a range of product offerings and services.
Gift cards are the preferred way of giving and receiving gifts. They carry a monetary value that can be redeemed for gifts at your favorite store.
Onyx GiftCards are “Open Gift Cards” which means that they can be redeemed at multiple merchant locations. They are standard credit card size, can fit into the average wallet and made of PVC plastic. Onyx GiftCards are Barcoded for security and safety for the consumer and bear a disclaimer at the back.
Onyx Giftcards can be bought with a branded Card backer which is black in colour and is designed to fit the card. There is an area to write a brief message to the recipient as well.
The Luhn test, also known as the mod 10 algorithm, is a simple checksum formula used to validate a variety of identification numbers, most notably credit card numbers. It's designed to protect against accidental errors in data entry.
To perform the Luhn test, you start from the rightmost digit of the number, double every second digit from the right, and if the doubled value is greater than 9, subtract 9 from it. Then, sum all the digits together. If the total modulo 10 is 0, the number is valid according to the Luhn test.
The Luhn test is crucial for preventing fraud and ensuring data integrity. By using this test, you can quickly check if a credit card number has been entered correctly, helping to reduce errors and potential security breaches.