# Postman Collections
source: https://developer.mastercard.com/ob-accept-payments/documentation/developer-support/postman-collections/index.md

Postman is an application for easy RESTful API exploration. You can use Postman to test API calls multiple times without having to write code. You can save multiple sets of credentials to quickly test an API's calls in the available environments.

Refer to [this tutorial](https://developer.mastercard.com/ob-accept-payments/tutorial/call-postman-collection/index.md) for the steps required to get started with the Mastercard Open Finance Accept Payments Postman collection.

Use the button below to access our Postman collection and explore the API.
Note: Select Mastercard Open Finance Accept Payment APIs from the list of collections and use the Mastercard Open finance - Accept Payment - EU Sandbox/MTF environment. [![](https://static.developer.mastercard.com/content/ob-accept-payments/uploads/postman-button.svg)](https://www.postman.com/mastercard/mastercard-open-finance/collection/75ipwq0/mastercard-open-finance-accept-payment-apis?action=share&creator=26779181&active-environment=26779181-f833703e-06d0-4b5b-be9e-8df72ffff973)