title: Is there any way for an app to get notifications when a member has been added/removed from an MS teams channel?
body: <p>I am working on a connector that would allow users to post cards to any channel they are members of.</p>
  
  <p>The idea is they would choose the info they want to post and then choose from a list of available channels which channel to post it to. To do this my app needs to know which members belong to which channels.</p>
  
  <p>I think I can see how to get the list of current members when the connector is added to or removed from a channel but I do not know how to automatically find out when a member is added or removed from a channel after the connector has been added.</p>
  
  <p>Is this possible or would I need to periodically poll Teams to find out if a member belongs to a channel or not.</p>