Testing

Use the sandbox environment to test your Synapto Collect integration. See Environments for sandbox and production URLs.

Test card numbers

The sandbox accepts any valid card number. You can use these:

Use any future expiry date and any CVV (e.g. 999).

Simulating declines

To trigger a declined payment, use an amount less than 1.00 in the payment currency (less than 100 in the API's minor-unit format). For example, 0.50 GBP will be declined.

3D Secure test cards

Whether 3DS is triggered in sandbox depends on how your test account is configured. If you don't see 3DS challenges, contact [email protected] to check your account setup.

Use these cards to test 3D Secure authentication flows: