# Integration and Testing
source: https://developer.mastercard.com/commercial-event-notifications/documentation/integration-and-testing/index.md

## Ready to begin Testing? {#ready-to-begin-testing}

Tip: We recommend that you begin testing in the sandbox.

Once you have created a project on Mastercard Developers, generated sandbox credentials and received approvals, you can start testing.

## Commercial Event Notifications Test Cases Tutorial {#commercial-event-notifications-test-cases-tutorial}

Follow our [Tutorials and Guides](https://developer.mastercard.com/commercial-event-notifications/documentation/tutorial-guides/index.md) for help about Commercial Event Notifications-specific test cases.

### Base URLs for Testing: {#base-urls-for-testing}

* Sandbox
* Production

```xml
https://sandbox.api.mastercard.com/commercial-event-notifications/
```

```xml
https://api.mastercard.com/commercial-event-notifications/
```

## Methods of testing Sandbox/Production: {#methods-of-testing-sandboxproduction-br}

### 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/reference_application_tutorial/index.md).

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

> * [Postman Collections](https://developer.mastercard.com/commercial-event-notifications/tutorial/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/postman-collection/) 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 Business Payment Controls OAuth API using Insomnia.

## Next Steps {#next-steps}

* You can head to our [Reference Application](https://developer.mastercard.com/commercial-event-notifications/documentation/reference_application_tutorial/index.md) page to download our Spring Boot Application that shows a typical usage of the Business Payment Controls API.
* To learn more about any error codes you receive, head over to our [Codes and Formats](https://developer.mastercard.com/commercial-event-notifications/documentation/codeandformats/index.md) section to learn about the details of all the error codes.