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Redeem your gift cards at any of our Merchants
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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.
A test card number generator produces fake card numbers that pass format and checksum validation so developers can run payment flows in a sandbox without touching a real account. The generated digits only work in test mode. A live payment gateway rejects them, which is exactly what makes them safe to use in development.
Payment forms validate card numbers before they ever reach a bank. They check the length, the issuer prefix, and the Luhn checksum. A generator simply builds digits that satisfy those rules. Most tools let you pick a card brand and a test outcome, then return a number, an expiry date, and a CVV that your sandbox will accept.
That is the whole purpose. It is a developer convenience, not a way to obtain working card data. Any number from a generator is fictional and tied to no account.
The Luhn algorithm, also called the mod 10 check, is the reason a random string of digits fails but a generated one succeeds. It works like this:
A generator can compute a final check digit that forces the sum to a multiple of ten. That single digit is what separates a plausible test number from a rejected one. Luhn does not confirm that an account exists. It only confirms that the digits are well formed.
Most major processors publish their own test card numbers, and these are the better choice for serious testing. They map to specific behaviors inside the sandbox, so you can trigger a successful charge, a decline, an expired card error, or a 3D Secure challenge on demand.
Stripe, PayPal, and the Visa Developer Center all maintain documented test card lists. Using them means your results match what other developers see, and your test suite stays reproducible. A generic generator cannot guarantee that a given number maps to a specific response code.
Testing only the happy path leaves most of your error handling unverified. Sandbox card numbers exist so you can force each of these branches without spending money or handling anyone's real credentials.
Test numbers are only valid in a test environment. Using a generated number against a live gateway will fail, and attempting to test real card data is a serious problem. Card network rules and PCI DSS treat the CVV as sensitive authentication data that must never be stored after authorization. Buying, selling, or trading real CVV numbers is card fraud and is prosecuted as such. A test card number generator has no connection to that world, and no legitimate tool will ever hand you a working account number.
If you are building or reviewing a checkout flow, stay in sandbox mode, use the processor's published test cards, and keep real card data out of your logs, your database, and your test fixtures.