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

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 tutorial](https://developer.mastercard.com/commercial-event-notifications/documentation/tutorials-and-guides/example-tutorial/) is an API client that allows developers to test your API calls in sandbox and production environments without writing any code. This makes sharing pre-formed API requests with partners extremely easy, and permits partners to run individual API requests or those within a folder or the entire collection.
> * For detailed steps, follow our [Postman Collections](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 that developers use quickly and easily to send REST requests to Mastercard APIs. API Consultancy \& Standards developed an [Insomnia Plugin](https://github.com/Mastercard/insomnia-plugin-mastercard) for handling 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 OAuth API using Insomnia.