# Configuring Commercial Event Notifications Endpoints Using Postman
source: https://developer.mastercard.com/commercial-event-notifications/documentation/tutorials-and-guides/example-tutorial/index.md

## Overview {#overview}

![Tutorial](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/mc_icon_Training_orng1.png "Postman Training")

Postman is an API platform for building and using APIs. It will help you configure your Commercial Event Notifications endpoints to make a successful call.

### You will learn how to: {#you-will-learn-how-to}

* Use Commercial Event Notifications endpoints in Postman.

## Install Postman {#install-postman}

![Download Postman](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/mc_icon_Developer_orng.png "Download Postman")

Postman is available as a native desktop app for Mac (Intel and M1), Windows (32-bit / 64-bit), and Linux (64-bit) operating systems.

To get the latest version of the Postman, visit the [download page](https://www.postman.com/downloads/) and select **Download**.

### Install Postman on Windows {#install-postman-on-windows}

Postman is available for Windows 7 and later.

1. Download the latest Postman version.
2. Select and run the `.exe` file to install Postman.

### Install Postman on Mac {#install-postman-on-mac}

Postman is available for macOS 10.11 (El Capitan) and later.

1. Download the latest Postman version.
2. If your browser downloads the file as a zip file, find it in the Downloads folder and unzip it.
3. Double-click the Postman file to install it in the Downloads folder.
4. When prompted, move the file to your Applications folder. This will ensure that future updates can be installed correctly.

Note: You may encounter a **Library not loaded** error if you unzip and install Postman using a third-party archiving app. Use the default **Archive Utility** for Mac to unzip the file.

## Create requests {#create-requests}

## Prerequisites {#prerequisites}

* [API keys](https://developer.mastercard.com/platform/tutorial/use-postman-for-mastercard-apis/step-2/)
* [Postman Configuration](https://developer.mastercard.com/platform/tutorial/use-postman-for-mastercard-apis/step-4/)

You can specify the details of your request. For example, you can enter a URL, choose a method, and specify optional values such as `authorization` and `parameters` if needed.

You can also create a new request from the Postman home screen, by using **New \> HTTP Request** , or by selecting **+** to open a new tab.

![Create request](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/create_request2.png "Create request")

## Set request URL {#set-request-url}

Navigate to the Variables tab and make sure the baseUrl **Current Value** has the appropriate endpoint set up.

![Set request](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/set-request1.png "Set request")

## Select the request method {#select-the-request-method}

Postman will default select the `GET` method for new requests. The `GET` method is for retrieving data from an API.

You can specify other methods to send data to your API, including the following:

* `POST` create or add new data
* `PUT` update or replace existing data
* `DELETE` delete existing data

![Select method](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/select_request_method1.png "Select method")

For example: `GET {{baseUrl}}/fieldmappings` and select `Send`.

You get a `200 OK` HTTP status response.

![200 OK response](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/request_response1.png "200 OK response")

In this example, Postman is the client application. Here's what happens when you call a `GET` request:

1. Postman sends a `GET` request to the Commercial Event Notifications API server located at `api.mastercard.com/commercial-event-notifications`.
2. The API server receives the request, fetches the requested data, and returns a response to Postman.
3. If successful, Postman displays a `200 OK` in the response panel.

## Next steps {#next-steps}

![Reference app tutorial](https://static.developer.mastercard.com/content/commercial-event-notifications/documentation/img/mc_icon_Gears_orng.png "Reference app tutorial")

#### Use the reference application {#use-the-reference-application}

This tutorial explains how to use the Commercial Event Notifications API in a Java environment.

[View tutorial](https://developer.mastercard.com/commercial-event-notifications/documentation/reference_application_tutorial/index.md)