# Using the Postman Collection
source: https://developer.mastercard.com/open-finance-us/documentation/integration-and-testing/postman-collection/index.md

The Mastercard Open Finance Postman collection provides a quick and convenient way to explore and test the Open Finance APIs. You can use it to try out API calls, inspect responses, and generate code snippets for your application.

## Prerequisites {#prerequisites}

Before using the Postman collection, you should:

1. [Generate your credentials](https://developer.mastercard.com/open-finance-us/documentation/quick-start-guide/index.md#generate-your-credentials) (Partner ID, Partner Secret, and App Key)
2. [Create a test customer](https://developer.mastercard.com/open-finance-us/documentation/quick-start-guide/index.md#welcome-your-first-customer)

## Getting Started {#getting-started}

1. Click Run in Postman
2. Fork the collection so that you can try it online (you can also choose to import a copy of the collection if you have the Postman client application set up already).
3. Select the *Test Drive* environment (top right) and update the `partnerId`, `partnerSecret`, `appKey` and `customerId` variables.
4. Click **Send** on individual requests, or **Run collection**
5. Explore the **Pre-request Script* and *Tests** tabs, and update the collection as you wish
6. Generate [code snippets](https://learning.postman.com/docs/sending-requests/generate-code-snippets/) you can use in your application

![Postman workspace](https://static.developer.mastercard.com/content/open-finance-us/uploads/postman-request.png)

## See Also {#see-also}

* [Quick Start Guide](https://developer.mastercard.com/open-finance-us/documentation/quick-start-guide/index.md)
* [Generating an API Client Library](https://developer.mastercard.com/open-finance-us/documentation/integration-and-testing/generating-an-api-client-library/index.md)
* [Test Profiles](https://developer.mastercard.com/open-finance-us/documentation/integration-and-testing/test-the-apis/index.md)
* [API Reference](https://developer.mastercard.com/open-finance-us/documentation/api-reference/index.md)