# Integration and Testing
source: https://developer.mastercard.com/doconomy-aland-index/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.

Start by following our:

### 1. Aland Index Service test cases tutorial {#1-aland-index-service-test-cases-tutorial}

Follow our [Aland Index Insomnia Testing Tutorial](https://developer.mastercard.com/doconomy-aland-index/tutorial/api-testing/index.md) for help with Aland Index-specific test cases. To set up end-to-end application, follow this tutorial: [Build end-to-end application](https://developer.mastercard.com/doconomy-aland-index/tutorial/build-end-to-end-application/index.md).

### 2. Using our base URLs for testing {#2-using-our-base-urls-for-testing}

* Sandbox
* Production

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

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

## 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, follow our [Reference Application Page](https://developer.mastercard.com/doconomy-aland-index/documentation/reference-app/index.md).

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

> * [Postman Collections](https://www.postman.com/collection/) is an API client that allows developers to test your API's 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 Page](https://developer.mastercard.com/doconomy-aland-index/documentation/postman-collection/index.md).

### 3. Insomnia {#3-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 \& 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 Aland Index API using Insomnia.

👉 Download our Insomnia Collection here:
[Insomnia_collection_2025.yaml](https://static.developer.mastercard.com/content/doconomy-aland-index/uploads/Insomnia_collection_2025.yaml) (11KB)

## Next Steps {#next-steps}

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