# Integration and Testing
source: https://developer.mastercard.com/fld-fraud-submission/documentation/integration/index.md

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

Tip: We recommend that you begin testing in the Sandbox environment.

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

**Getting Started**

### 1. Follow the test cases tutorial {#1-follow-the-test-cases-tutorial}

Use our [Testing Tutorial](https://developer.mastercard.com/fld-fraud-submission/documentation/use-cases/testing/index.md) to learn how to create and run test cases specific to the Confirmed Fraud API.

### 2. Use the base URLs for testing {#2-use-the-base-urls-for-testing}

```Sandbox
https://sandbox.api.mastercard.com/
```

```Production
https://api.mastercard.com/
```

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

### 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, refer to [Reference Application](https://developer.mastercard.com/fld-fraud-submission/documentation/reference-app/index.md) section.

### 2. Insomnia {#2-insomnia}

* [Insomnia](https://insomnia.rest/) is an open-source API client that developers use to quickly and easily send REST requests to Mastercard APIs. API Consultancy and 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 FLD APIs using Insomnia.   

👉Download our Insomnia Collection here:
[Confirmed_Fraud.zip](https://static.developer.mastercard.com/content/fld-fraud-submission/uploads/Confirmed_Fraud.zip) (5KB)

## Next Steps {#next-steps}

* Now that you have an understanding of testing, you can proceed to the [Postman Collections](https://developer.mastercard.com/fld-fraud-submission/documentation/postman-collection/index.md) section to fork our Postman Collections and begin making calls.
* You can head to our [Reference Application](https://developer.mastercard.com/fld-fraud-submission/documentation/reference-app/index.md) page to download our Spring Boot Application that shows a typical usage of the API.
* To learn more about any error codes you receive, head over to our [Codes and Formats](https://developer.mastercard.com/fld-fraud-submission/documentation/code-and-formats/index.md) section to learn about the details of all the error codes.