# Testing
source: https://developer.mastercard.com/mastercard-developers-api/documentation/testing/index.md

A quick way to test the Mastercard Developers API is by running the Postman Collection provided in the [Quick Start Guide](https://developer.mastercard.com/mastercard-developers-api/documentation/quick-start-guide/index.md). The Postman Collection provides sample requests for all the endpoints of the Developers API. All you have to do is provide the API credentials (consumerKey and privateKey) to be able to successfully call the APIs.