Payment Link Card Test
Securely test your payment link card with our comprehensive guide.
Redeem your gift cards at any of our Merchants
You can purchase a gift card from any of these locations
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 checkout link is a hosted payment page that a payment provider generates in sandbox mode, where the checkout form accepts published test card numbers instead of real card data. It exists so developers can run a complete payment flow, including card validation, authentication steps, webhooks, and failure responses, without moving real money. The link behaves like a live payment page, but every authorization is simulated.
Payment providers publish their own test card lists in their developer documentation. Stripe, Adyen, PayPal, Checkout.com, and similar processors each maintain a set of numbers that pass basic checksum validation but have no real account behind them. Some providers also publish special amounts or card values that force a decline, an expired-card response, or a 3D Secure challenge. Always pull the numbers from the documentation of the provider whose test card checkout link you are using, because a number that works on one platform may return an unsupported-brand error on another.
The most common cause is a mode mismatch. Live keys reject test card numbers, and sandbox keys reject real cards. Other frequent problems include expired test numbers that the provider has retired, a card brand not enabled for the account region, a webhook endpoint that is unreachable, or a cached session that still holds an old configuration. Clearing cookies or opening the link in a private window resolves many of these cases.
Published test card numbers carry no value and belong only in test environments. Real card numbers must never be typed into a sandbox form, since that turns a testing exercise into an unapproved handling of cardholder data. Keep sandbox and production data separated, restrict who can access test credentials, and follow the terms your provider sets for sandbox use.