Developers
A Full Production Clone, Minus the Money
The PayColab sandbox mirrors production exactly — same API, same routing engine, same dashboard — with simulated PSPs so you can test smart routing, cascading, declines, and webhooks safely.
Simulated PSP Fleet
Virtual gateways with configurable approval rates, latencies, and outage modes to rehearse every failure path.
Scenario Triggers
Force specific decline codes, 3DS challenges, and cascading waterfalls using magic amounts and test cards.
Free to Evaluate
Unlimited sandbox transactions while you evaluate — free, with no credit card and no commitment.
Test Cards
| Card Number | Scenario | Result |
|---|---|---|
4242 4242 4242 4242 | Standard approval | Approved on primary route |
4000 0000 0000 0002 | Hard decline | Declined, no cascade retry |
4000 0000 0000 9995 | Soft decline | Declined, cascades to fallback and approves |
4000 0000 0000 3220 | 3DS challenge | Triggers 3D Secure 2.0 challenge flow |
5555 5555 5555 4444 | Mastercard approval | Approved via Mastercard route |