How to authenticate using third-party OAuth 2.0 identity management to authenticate its users

 Company A implements several Azure logic apps that have HTTP triggers: The logic apps provide access to an on-premises web service 

A company establishes partnership with B company 

Company B does not have an existing azure active directory ( AAD ) tenant and uses third-party OAuth 2.0 identity management to authenitcate its users.

preferred azure service, Azure API Management 

( what is Azure API Management Service ? )

API Managment helps organizations publish APIs to external, partner and internal developers to unlock the potential of their data and services.

You can secure API management using the OAuth 2.0 client credentials flow.