Try Fyber's checkout in test mode.
No signup required. Use any of the test cards below to walk through a full payment flow against our sandbox.
Pay $10 USD on the test gateway.
The hosted checkout below is wired to api.sandbox.fyber.one — every interaction here is fake.
Sandbox embed coming soon.
We're finalising the sandbox checkout iframe. In the meantime, create a free test account to get a live sk_test_ key and try the API directly.
Numbers that simulate every flow.
Click any number to copy it. Use any future expiry and any 3-digit CVC.
| Brand | Number | Outcome | Hint |
|---|---|---|---|
| Visa | Succeeds | Use any future expiry, any 3-digit CVC. | |
| Mastercard | Succeeds | Use any future expiry, any 3-digit CVC. | |
| Visa | Declines (generic) | Returns do_not_honor. | |
| Visa | Declines (insufficient funds) | Returns insufficient_funds. | |
| Visa | Declines (expired card) | Returns expired_card. | |
| Visa | 3DS challenge | Triggers a frictionless 3DS step. | |
| Visa | Card stored to vault | For tokenisation flows. |
Everything the live API does, in safe mode.
Webhooks
Test endpoints fire all the same events as live. Use the dashboard to replay any event.
Subscriptions
Trial periods, renewal, dunning — accelerate time in test mode to walk through the full lifecycle in seconds.
BNPL
Installment plans run in compressed time. Test missed payments, retries, and customer notifications.
Disputes
Trigger chargebacks via the test card range and walk through the full dispute response flow.
FraudGate
Test-mode FraudGate uses the same scorers as live but with a relaxed threshold so you can see the full pipeline output.
Settlements
Simulated settlement runs nightly. Funds appear in your test bank balance the next morning.
Ready to wire it up for real?
Test keys are free, and you can switch to live whenever your KYC is approved.