# Testing
source: https://developer.mastercard.com/payment-account-management/documentation/testing/index.md

Once you have onboarded to Payment Account Management using our onboarding tutorial, generated API keys, and reviewed the use cases, you can start testing.

You can import the yaml file available on the [API reference](https://developer.mastercard.com/payment-account-management/documentation/api-reference/index.md) page into Insomnia and use the Mastercard plugin to test this API with the OAuth Authentication [Insomnia Plugin](https://developer.mastercard.com/platform/documentation/using-oauth-1a-to-access-mastercard-apis/#insomnia-plugin). Refer to [Environment Domains](https://developer.mastercard.com/payment-account-management/documentation/environment-domains/index.md) for the detailed URLs.

## Prerequisites {#prerequisites}

You will require the following artefacts:

* The P12 Certificate file for your project for OAuth authorization to the API.
* The Public and Private encryption keys that are used for field level encryption in the API calls -- [Encryption keys](https://developer.mastercard.com/payment-account-management/documentation/api-basics/index.md#encryption).