CVV Test for Security: How to Validate Card Verification Correctly
A CVV test checks that your payment stack validates the card verification value at authorization and never stores it. Run it in a sandbox, not with live cards.
Redeem your gift cards at any of our Merchants
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.
Do not buy test card numbers. Legitimate test card numbers are free from your payment processor's developer documentation. They work only in sandbox mode. Buying or using real card numbers, including CVV data, without authorization is illegal and violates card network rules. Use test numbers to validate payment flows, then switch to live credentials only after certification.
A test card number is a synthetic number that mimics the structure of a real payment card. Payment processors publish these numbers so developers can test checkout forms, authorization logic, and error handling without touching live cardholder data. Test numbers pass the Luhn check and have a defined expiry and CVV format. They do not connect to real accounts. They cannot be used to move money.
Test card numbers follow the same format rules as live cards. Most major card brands use 16 digits, though some ranges use 13 to 19 digits. The Luhn algorithm must validate the number. Expiry dates are usually set in the future, and test CVV values are commonly three digits for Visa, Mastercard, and Discover, and four digits for American Express. Your processor will specify exact test values. Do not assume a test number works across processors. Each sandbox has its own set.
No. Test card numbers are free from processors. Anyone selling test card numbers or CVV data is likely selling stolen data or committing fraud. Do not engage.
No. They are synthetic. They pass format checks but do not link to real accounts. They only work in sandbox mode.
Many processors list 4242 4242 4242 4242 as a Visa test number. Use it only in sandbox mode with any future expiry and a test CVV from the same documentation. Confirm the exact test values with your processor.
Test numbers do not expire, but the test expiry date you enter must be valid at the time of testing. Processors often recommend a future date.