4. Synchronize!

Navigate to the sandbox's management console on http://localhost:5001/client -- remember, this is your mock EHR. Fill out the "User Session Info" and click Update to simulate a user's workflow action. Take special care to provide a topic that matches your subscription's.

The Hub should generate and send an HTTP Post something like this:

{
  "timestamp": "2018-06-13T01:56:11.8281368Z", 
  "id": "0c3b67ab5344428c840c4a745dbdf523", 
  "event": {
    "hub.topic": "5000-4", 
    "hub.event": "open-patient-chart", 
    "context": 
      ["patient123"]
    }
  }