# API Basics
source: https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/aiia-pay/api-basics/index.md

* [API Authentication](https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/aiia-pay/api-basics/api-authentication/index.md)
* [Environments](https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/aiia-pay/api-basics/environments/index.md)