# Insomnia Collection
source: https://developer.mastercard.com/agent-suite-for-merchants/documentation/developer-tools/insomnia-collection/index.md

👉 Keep this page only if Insomnia is a supported testing path for your service. Replace the destination links, workspace name, plugin expectations, and prerequisites if you provide a service-specific workspace or import file. If you later add a CTA button here, use the standard button shortcode with a `primary` type, the exact import or workspace URL, and the label you want users to click.

## Insomnia Collection {#insomnia-collection}

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

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

## Overview {#overview}

The Insomnia guide covers how to set up Mastercard API requests in Insomnia, including plugin installation, workspace import options, environment configuration, and request execution.

## Prerequisites {#prerequisites}

* Access to a Mastercard Developers project with the credentials required by the API you are testing
* Insomnia installed on your machine
* The correct authentication and encryption details for the service you want to call

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

* Plugin installation options for Insomnia
* Import guidance for collections and workspace templates
* Environment setup for OAuth 1.0a, OAuth 2.0, and JWE-enabled flows
* Practical steps for sending and validating requests in Sandbox and Production