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

* [API Authentication](https://developer.mastercard.com/open-finance-europe/documentation/licensed/aiia-enterprise/api-basics/api-authentication/index.md)
* [Advanced Topics](https://developer.mastercard.com/open-finance-europe/documentation/licensed/aiia-enterprise/api-basics/advanced-topics/index.md)
* [Environment Domains](https://developer.mastercard.com/open-finance-europe/documentation/licensed/aiia-enterprise/api-basics/environments/index.md)
* [Payload Encryption](https://developer.mastercard.com/open-finance-europe/documentation/licensed/aiia-enterprise/api-basics/payload-encryption/index.md)
* [Code and Tokens](https://developer.mastercard.com/open-finance-europe/documentation/licensed/aiia-enterprise/api-basics/code-and-tokens/index.md)