# Environments
source: https://developer.mastercard.com/mastercard-processing-dispute/documentation/api-basics-section/environments/index.md

The following table describes the different environments that are available.

|          Environment           |                                                                                                                                                                                                                                                                                                                                                                                         Description                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Sandbox                        | An early-access environment containing limited-capacity mock APIs enables you to try the APIs quickly to assist with initial integration and solution development. The Sandbox returns mock responses for a defined request (see [Sandbox testing](https://developer.mastercard.com/mastercard-processing-dispute/documentation/sandbox-testing/index.md)) and should not be used for complete integration testing. Use your Sandbox keys to authenticate with this environment. The keys are set up when you [create your project in the Mastercard Developer portal](https://developer.mastercard.com/mastercard-processing-dispute/tutorial/create-sandbox-apis/index.md).                                                                                                                |
| Mastercard Test Facility (MTF) | The MTF environment provides access to the latest production release version of APIs to conduct full User Acceptance Tests (UAT) before moving to production. It supports end-to-end testing of product functionality through API, batch, and GUI interfaces. MTF is maintained and supported by Mastercard Processing, ensuring it remains functionally aligned with the production environment. Access to the MTF environment is included as part of the onboarding and implementation process offered by Mastercard Processing. Use your Sandbox keys to authenticate with this environment. The keys are set up when you [create your project in the Mastercard Developer portal](https://developer.mastercard.com/mastercard-processing-dispute/tutorial/create-sandbox-apis/index.md). |
| Production                     | A complete production environment containing the latest production API release. Use your Production keys to authenticate with this environment. The keys are set up when you [request Production access](https://developer.mastercard.com/mastercard-processing-dispute/tutorial/move-project-to-production/index.md) for your project (through your project page).                                                                                                                                                                                                                                                                                                                                                                                                                          |