This is the library to execute oAuth2 Authentication. It has the action and the Rest wrappers to communicate with Microsoft to get an Authentication token. 

Microsoft OAuth2 Login library enables you to Login using Microsoft credentials with OAuth 2.0 from Azure Active Directory (Azure AD). In addition to the actual Login, this enables you to use OAuth Token to get authorization to access Microsoft Rest APIs, like PowerBI, Dynamics 365 Connector, and among others.