# Test payment transactions

This section describes how to test payment transactions in Rebilly using the sandbox environment and TestProcessor gateway.

## Overview

Testing payments in Rebilly involves using test card numbers, configuring test environments, and simulating various transaction scenarios.
No real charges are made when testing in the sandbox environment.

Test cards, IBANs, and ACH details
Simulate different payment outcomes in the sandbox environment using test cards, IBANs, and ACH details.

Run test transactions in the sandbox
Test your integration in the sandbox environment.

Test a generic offsite approval flow
Simulate a generic offsite approval flow.

Test a 3ds challenge flow
Simulate a 3DS challenge flow.

Environments
Learn about the sandbox and live environments.

Go live
Switch your integration from the sandbox to the live environment.