This scope lets an app "View messages and other content in direct messages that your slack app has been added to"
im.history- Fetches history of messages and events from direct message channel.
im.replies- Retrieve a thread of messages posted to a direct message conversation
im_history_changed- Bulk updates were made to a DM's history
message- A message was sent to a channel
message.im- A message was posted in a direct message channel