# Postman Collection
source: https://developer.mastercard.com/commercial-connect-api/documentation/developer-tools/postman-collection/index.md

## Postman Collection {#postman-collection}

Use Postman to test Mastercard APIs with a ready-made workflow for importing collections, configuring environments, and validating requests in Sandbox or Production.

For the full step-by-step guide, open the [Postman Collection guide](https://stage.developer.mastercard.com/platform/documentation/developer-tools/postman-collection/).

**POSTMAN WORKSPACE**

Open the official Mastercard Postman workspace to fork collections and start testing faster.

[Run in Postman](https://www.postman.com/mastercard/workspace/mastercard-developers/overview)

## Overview {#overview}

The Postman guide covers how to set up Mastercard API requests in Postman, including collection setup, environment and base URL configuration, authentication setup, and encryption handling.

## Prerequisites {#prerequisites}

* Access to a Mastercard Developers project with the credentials required by the API you are testing
* A Postman account and either the Postman web app or desktop application
* The correct authentication and encryption details for the service you want to call

## What You Will Find {#what-you-will-find}

* Collection setup by forking a Mastercard workspace or importing an OpenAPI specification
* Environment and base URL configuration for Sandbox and Production
* Authentication guidance for OAuth 1.0a, OAuth 2.0 / FAPI 2.0, and MTLS
* Encryption setup steps for Mastercard encryption and JWE-based flows