# The Importance of Testing

## Overview

**Testing** is a crucial part of the development process, ensuring that your application works as intended and meets the needs of your users. It helps identify bugs, verify functionality, and ensure that changes do not introduce new issues.

We highly recommend to make full use of our Sandbox environment by creating test Sub-Accounts and simulating transactions. This allows you to experiment with different scenarios, validate your implementation, and ensure everything works smoothly before going live.

It is crucial to make sure that the complete payment cycle is integrated and tested correctly before attempting to process real transactions. Otherwise, customers' personal information and card details could be compromised, leading to potential security breaches and financial losses.

Please note we offer a list of [Testing Cards](/documentation/get_started/process_payments/test_cards) that you can use to simulate different payment scenarios in the Sandbox environment.