Picture this: the PaymentController is written, the route exists, and the order model is ready. Calling a payment endpoint is the obvious next step. But whose? No gateway has been chosen, the client's last email went unanswered, and there's no test key in sight. Rather than stopping to create a provider account that may not even be the right one, a dummy payment gateway lets you keep building.
What the word "dummy" actually means here
Not a stub. Not a placeholder. Send a request to the init endpoint and a payment URL comes back. On the checkout page, pick an outcome — success or decline — and your verify call returns a full transaction record with the same structure you'd get from a live processor. Webhook events fire to whatever URL you registered. Only one piece is missing: a real bank on the other end.
Waiting for official credentials before the architecture is settled doesn't make a project safer. Mostly it just pushes the start date back.
Why not go straight to a real sandbox?
Eventually, yes. But most payment providers require a full account before sandbox access: email confirmation, business details, sometimes a manual review. For checking that a redirect flow works before any provider has been chosen, that's the wrong process at the wrong time.
Skipping that signup and starting with a local endpoint is faster — and doesn't lock the project into a provider decision before it's ready to be made.
Where this approach fits a real project
Early prototyping is the obvious case. Less obvious: client work where a demo needs to exist before the client finishes their gateway onboarding; evaluations where two or three providers are being compared before committing to one; CI pipelines where payment tests need to run without depending on a service that can rate-limit or go down at the wrong moment.
One thing to check before picking a tool
Look at the response format. If the verify endpoint returns data in a completely different shape from the real gateway you'll eventually use, there's a rewrite waiting right before launch. Swapping in real credentials should be a config change — base URL, API key, webhook secret — nothing more.
MockGateway's playground covers Stripe, PayPal, Razorpay, and several others with response shapes matched to each. A live endpoint in under a minute, no account required.
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