# Authorization flows and API Clients

Learn about Composable Commerce OAuth 2.0 for API authentication.

Learning objectives

After completing this module, you should be able to:

- Demonstrate best practices related to authorization flows and API Clients.
- Understand when to use specific grant types.

Agenda

1. [Authentication and authorization](https://docs.commercetools.com/learning-composable-commerce-developer-essentials/authentication-authorization/authentication-and-authorization.md)
2. [Scopes](https://docs.commercetools.com/learning-composable-commerce-developer-essentials/authentication-authorization/scopes.md)
3. [Learning check](https://docs.commercetools.com/learning-composable-commerce-developer-essentials/authentication-authorization/learning-check.md)

Prerequisites

- [Organizations, Teams, and Projects](https://docs.commercetools.com/learning-model-your-business-structure/organizations-and-projects/overview.md) module
- Understand [OAuth concepts](https://oauth.net/2/).
- Experience working with APIs.
- Understand the basic concepts of authentication and authorization.

Audience

- Functional or system architects
- Technical management
- Backend and frontend developers

## Related pages

- [Section overview page](https://docs.commercetools.com/learning-composable-commerce-developer-essentials.md)
- [Next page: Authentication and authorization](https://docs.commercetools.com/learning-composable-commerce-developer-essentials/authentication-authorization/authentication-and-authorization.md)