Azure: Setup OAuth2.0 between ADF and APIM for secured and authenticated traffic

•  Create Service Principal - to be presented to APIM for Auth token
• Create App Registration
• Under Token configuration, add optional claim to ensure only app call end point not the user/human
• No explicit permission needed
• Add the Application URI
• No explicit scopes needed
• No RBACs as resources level as this is for API not users
• 
  
• SPN Name: dept-proj-env-oauth
• SPN API Permissions: none
• SPN RBAC permissions: none
• SPN RBAC permission scope: none
• 
  
• Create Policy for APIM to validate request
• Write the policy, 
• Route the backend if request successful
• ADF pipeline to use api://imdev-dev part of the REST request ( which is also application URI for SPN)