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About MockGateway

MockGateway exists so payment integration code can be tested before provider accounts, sandbox credentials, and dashboard setup are ready. It gives teams a predictable layer for checkout, webhook, and failure-path testing.

What we set out to solve

Every team that builds a checkout flow eventually needs to handle declined cards, one-off webhook failures, 3D Secure challenges, and gateway timeouts. Testing these scenarios against real provider sandboxes means managing credentials for each gateway, navigating different API docs, and dealing with inconsistent test environments. We wanted a single platform where all of that works out of the box — so we built MockGateway.

How templates are verified

MockGateway templates are built to behave like the provider flow your application has to handle: request fields, response statuses, hosted checkout states, redirects, and webhook payloads. They are not guesses written once and forgotten; the same template powers the API, demo playground, docs examples, and diagnostic checks.

  • Endpoint paths, methods, auth style, required fields, status names, and webhook shapes are compared against provider reference material before a template is treated as ready.
  • The diagnostic runner checks the product API and demo playground against the same template so the public docs, hosted checkout, and API responses do not drift apart.
  • Payment outcomes are fixed by each gateway template. Choose a supported outcome and inspect its response, redirect, and webhook.

What a mock can and cannot prove

A mock gateway is the right layer for application behavior: what your code does when a payment succeeds, fails, stalls, redirects, or sends the same webhook twice. A real sandbox is still the right layer for provider validation before launch.

  • MockGateway does not certify a real provider account or replace the final sandbox pass before launch.
  • MockGateway does not move money, store real card numbers, or prove that a provider has enabled a payment method on your account.
  • Use the real sandbox when you need to confirm credentials, dashboard configuration, API-version behavior, regional payment methods, or provider approval requirements.

Why developers choose MockGateway

Ready in under a minute

Choose a prebuilt gateway template, adjust the schema if you need to, and your test endpoint is live. No forms, no approvals.

Supports every major provider

Templates for Stripe, PayPal, Razorpay, Adyen, Braintree, Square, and eight more gateways. Or create a custom gateway from scratch.

Full end-to-end flow

More than mocked JSON — MockGateway provides hosted checkout pages, customer redirects, and real HTTP webhooks delivered to your server.

Zero risk, zero credentials

No real money moves, no card numbers stored, no provider API keys required. Your test environment is completely isolated.

What you get with MockGateway

  • Choose from 14+ prebuilt gateway templates or design a custom one with your own API schema
  • Hosted checkout pages with realistic payment flows, status selection, and customer redirects
  • Real webhook delivery to your server — no ngrok tunnels or manual testing required
  • A complete transaction log showing requests, responses, and webhook delivery results
  • Free to use with 500 test payment requests per month, with no credit card and no trial countdown