# Reference App
source: https://developer.mastercard.com/unified-installments/documentation/reference-app/index.md

The reference application is a simple Spring Boot Application that shows a typical usage of the Mastercard Installments APIs and how to integrate different operations in the Sandbox environment. You can either reuse or take code references for your implementation.
>
> #### What you will learn
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> * How to use the reference application
> * How to configure your application for the Sandbox and the Production environments
> * How to test your application

## Prerequisites {#prerequisites}

* [Java 11](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}

* Refer to the [unified-installments-reference-application.zip](https://static.developer.mastercard.com/content/unified-installments/uploads/unified-installments-reference-application.zip) (167KB) file.
* Follow the steps mentioned in the README.md file (available in the root directory of the application) to configure and run the application.