I am about to develop a REST API that will only have one "user" and I am curious about how I should implement security to make it as secure as possible(hopefully implementing some protocol that I am currently unaware of).
So initially I thought about implementing openID connect, however I believe that this won't be possible as the one user is an API that should be able to access my protected resources without user intervention.
I guess the question is: is there a standardized security protocol for these sort of cases, or does everyone just "go with the flow" and implement whatever works?