title: Dialogflow Slack Events
body: <p>Building a chatbot for Slack with Dialoglow and a custom fulfillment.
  I want to receive and handle the Slack event when the user opens a dialog with Bot.</p>
  
  <p>Event is <strong>im_created</strong></p>
  
  <p>I've checked on the custom subscription URL (without Dialoglow) and I'm able to receive this event. But inside Dialoglow I don't get any events.
  I suppose the problem is with the naming of events (attached as a link). Did somebody encounter this? </p>
  
  <p>Plus, I don't receive any other events. Request URL inside Slack is valid and correct (verified). </p>
  
  <p>How events inside Dialogflow are named:</p>
  
  <p><img src="https://i.stack.imgur.com/gDFJo.png" alt="How events inside Dialogflow are named"></p>