add JWT call flow image

configure/jwt-authentication.md

@@ -23,6 +23,10 @@ The private/public key pair is created in your [Tiny account page](https://apps.
 
 ## JWT Provider URL
 
+The following diagram explains the JWT call flow:
+
+![JSON Web Token Call Flow]({{site.baseurl}}/images/jwt-call-flow.png "JSON Web Token Call Flow")
+
 The easiest way to setup JWT authentication against TinyMCE cloud services is to create a JWT provider endpoint. This endpoint takes a JSON HTTP POST request and produces a JSON result with the token that the service will then use for all the HTTP requests.
 
 ## JWT requirements