# API Basics
source: https://developer.mastercard.com/cross-border-services/documentation/api-basics/index.md

The API Basics section consist of these topics:

* [API Security](https://developer.mastercard.com/cross-border-services/documentation/api-basics/api-security/index.md)
* [API Conventions](https://developer.mastercard.com/cross-border-services/documentation/api-basics/api-conventions/index.md)
* [Environments](https://developer.mastercard.com/cross-border-services/documentation/api-basics/environments/index.md)
* [Getting Started with the APIs using OAuth1.0A](https://developer.mastercard.com/cross-border-services/documentation/api-basics/getting-started-oauth1a/index.md)
* [Getting Started with the APIs using OAuth2.0](https://developer.mastercard.com/cross-border-services/documentation/api-basics/getting-started-oauth2/index.md)