I want a controller that receives a http post with  Name + Value data from SomeRandomServer.  This data is later written to a model.

IE An event occurs, SomeRandomServer sends a POST saying "event has occurred" and a field in a model is written to with "event has occurred".

How do I ensure that the data has actually came from SomeRandomServer and not an impersonator sending similar data? Normally with HTTP routes you can set the auth to user, but in this case the data is not coming from a user, but another api. So how would security be enforced? Can I restrict access to the route by some other means?