title: Office 365 API authentication from backend
body: <p>I am just starting to use the O365 apis, so forgive me if this is a dumb question.</p>
  
  <p>The samples I have seen so far uses manual login/authentication to the O365 account by a person. I need to Connect to SharePoint Online from a backend service that will provide New records to a list.</p>
  
  <p>Is there a way for an unattended backend Application to authenticate With O365 without the need for a user to enter credentials each time?</p>