# Reference App
source: https://developer.mastercard.com/priceless-planet-carbon-tracker/documentation/reference-app/index.md

**Please update the reference application. Some endpoints like Update User is missing here.**

The reference application is a simple Spring Boot Application that shows a typical usage of the Carbon Calculator Experience API and how to integrate different operations in the Sandbox environment. You can either re-use or take code references for your implementation.
>
> #### What you will learn {#what-you-will-learn}
>
> * How to use the reference application
> * How to configure your application for the Sandbox and the Production environments
> * How to test your application

## Pre-requisites {#pre-requisites}

* [Java 17](https://www.java.com/en/) and above installed
* [IntelliJ IDEA](https://www.jetbrains.com/idea/) (or any other IDE of your choice)

## Technologies Used {#technologies-used}

* [Spring Boot](https://spring.io/projects/spring-boot)
* [Apache Maven](https://maven.apache.org/)
* [OpenAPI Generator](https://openapi-generator.tech/)

## Get the Source Code {#get-the-source-code}

* Clone the [Carbon Calculator Experience Reference App](https://github.com/Mastercard/carbon-calculator-experience-reference-app) from GitHub and open it in your IDE.
* In the root directory of the application, follow the **README.md** file to configure and run the application.