Consuming Web API with Bearer Authentication Token

Question

I am trying to consume an external web api (REST) in my ASP.net web application. basically i have two APIs.

First one generates auth token which is to be passed to the next API to get Json String

 

kindly tell me , how to consume external web api in asp.net web application (non MVC) with bearer Authentication Token validation.

 

I am fairly new to this.. .early support would be helpful.

 

Thanks & regards