# Testing Notifications
source: https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/aiia-data/event-notifications/testing-notifications/index.md

We made a small [Postman Collection](https://www.getpostman.com/collection) and an [Environment](https://learning.getpostman.com/docs/postman/environments_and_globals/manage_environments/), so you can explore every tiny detail of our service with an absolute minimum setup.

Setting up Postman and running our collection is pretty straightforward:

1. First, you have to [Install Postman](https://www.getpostman.com/apps)

2. Then, you click the button below:

[![](https://static.developer.mastercard.com/content/open-finance-europe/uploads/postman-button.svg)](https://god.gw.postman.com/run-collection/20782065-58762784-b8db-4d70-b37b-2b7d10a5481f?action=collection%2Ffork&collection-url=entityId%3D20782065-58762784-b8db-4d70-b37b-2b7d10a5481f%26entityType%3Dcollection%26workspaceId%3D5b96ecad-9493-4bff-b64e-ee3e9d8e485b)

3. In the newly opened page, click `Postman for {Your Operating System}`.

4. The collection should be imported into Postman now. To verify this, click on `Collections` in Postman and check whether you have a collection named `Aiia Webhooks`. If it is not there, try importing it again with Postman running beforehand. Sometimes it might not be imported if Postman was closed before.

5. An `Aiia Webhook` environment is also imported with the collection. You can switch to it by clicking on the drop-down in the top left of the Postman and select the environment with the mentioned name.

6. Update the environment with the url which you expect to receive webhooks and optionally webhook secret to test `X-Viia-Signature` header.

7. Start executing requests one-by-one.

Note: Read the collection's description for additional details.