Testing your Integration

This page includes information about the Felloh sandbox environment, enabling you to make sure your integration works as planned.

You can use it to test different scenarios in your integration and ensure they are handled correctly.

Developer Sandbox

You can use the Felloh API sandbox domain for testing and implementation, these do not affect your live data or interact with the live card or banking networks.

Sandbox access needs to be created from your live account. The sandbox dashboard can then be accessed using the following url,


All of our apis can be used in the same way as in production, by using the sandbox subdomain rather than the api subdomain.


vs the live subdomain


Test Payments

Card Payment

You can use the following card numbers to test your integration,

VISA Debit: 4462 0300 0000 0000

VISA Credit: 4444 3333 2222 1111

Mastercard: 5555 5555 5555 4444

CVC numbers can be any 3 digit combination. The only requirement on expiration dates is that they are in the future.

Open Banking

Set the payment link amount to £10.10 to simulate a successful Open Banking transaction on the sandbox. Payments for any other amount will not be processed on the sandbox.

Use Nuapay credentials: Username: psu, Password: psu