Recently I was working on securing ASP.NET Web API HTTP service that will be consumed by a large number of terminal devices installed securely in different physical locations, the main requirement was to authenticate calls originating from those terminal devices to the HTTP service and not worry about the users who are using it. So first thing came to my mind is to use one of the OAuth 2.0 flows which is Resource Owner Password Credentials Flow, but this flow doesn't fit nicely in my case because the bearer access tokens issued should have expiry time as well they are non revocable by default, so issuing an access token with very long expiry time (i.e one year) is not the right way to do it.


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