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The open platform for simulating Payment Service Providers

Build, test, and demo payment integrations on a fully extensible mock PSP platform.

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Stripe, Adyen, and more.
Multi-PSP
Build your own PSP adapters.
Extensible SDK
Reliable testbed or demo backend for
your fintech product.
Test / Demo

Testing and demoing payments shouldn't be this hard.

When integrating PSPs
sandboxes are limited, slow, or don't exist.
When building fintech demos
realistic and stateful payment flows are hard to fake.

PayLab makes both effortless - a single platform to simulate real PSPs for testing, demos, and everything in between.

Product screenshot

Everything you need to simulate a real PSP

Complete Payment Lifecycles

Simulate every stage, from payments and refunds to settlements and payouts, with realistic state transitions.

Configurable Webhooks

Control webhook delivery delay, retry, and duplication to test your handlers under real-world conditions.

Adapter Architecture

Define new PSPs as plug-in adapters with custom endpoints and events.

Realistic API Mechanics

Mimics production behaviours — authentication, idempotency, and error codes — so your integration logic behaves as close as possible to live environments.

Canonical Model

Internally, PayLab maps all PSPs to a consistent data model and interfaces, enabling the community to build and publish mock PSPs on a unified contract.

Built in Public

PayLab is developed transparently, with every feature and improvement shared openly. Follow our journey as we shape the future of PSP simulations.

Use Cases

PayLab fits wherever you need realistic payment behaviour without external dependencies.

  • Test PSP integrations and orchestration logic Simulate all scenarios — success, failure, and edge cases — to ensure your payment flows behave correctly.
  • Automate tests in CI/CD pipelines Validate payment workflows, webhooks, and error handling automatically as part of your continuous integration.
  • Build and deploy demo systems Quickly create mock PSP backends for sales demos, customer onboarding, or product showcase environments.
  • Training and education Use realistic payment simulations to train teams, run workshops, or teach payment system concepts safely.