# Developer Tools
source: https://developer.mastercard.com/commercial-event-notifications/documentation/developer-tools/index.md

## Developer Tools {#developer-tools}

Use this section to access practical tools for testing and integrating with the Commercial Event Notifications API. Start with the reference application for implementation examples, or use the Postman and Insomnia collections to send requests quickly.

### 1. Reference Application {#1-reference-application}

> * Our Spring Boot Reference Application acts as an API client and allows you to integrate different operations.
> * For detailed steps, follow our [Reference Application](https://developer.mastercard.com/commercial-event-notifications/documentation/developer-tools/reference_application_tutorial/index.md).

### 2. Postman {#2-postman}

> * Postman is an API client that you can use to test API calls in the Sandbox and Production environments without writing code. You can run individual requests, a folder, or the entire collection. For a step-by-step walkthrough, see the [Postman tutorial](https://developer.mastercard.com/commercial-event-notifications/documentation/tutorials-and-guides/example-tutorial/).
> * To fork the collection and configure OAuth 1.0a signing, follow our [Postman Collection](https://developer.mastercard.com/commercial-event-notifications/documentation/developer-tools/postman-collection/index.md) page.

### 3. Insomnia {#3-insomnia}

> * [Insomnia](https://insomnia.rest/) is an open-source API client for sending REST requests to Mastercard APIs. API Consultancy \& Standards developed an [Insomnia plugin](https://github.com/Mastercard/insomnia-plugin-mastercard) that handles API authentication.
> * Follow our [Insomnia tutorial](https://developer.mastercard.com/platform/tutorial/use-insomnia-rest-client-for-mastercard-apis/) to learn how to test the Commercial Event Notifications API using Insomnia.