bitbucket server for slack (offical) app

[Douglas Moore]

We can only use this  app by creating slack app. Access our bb server is only allowed through vpn.  So I'm working on creating a slack app but stuck at scope sections. Documentation says to creates scopes however it doesn't specify whether it is bot, user or both. 

In the bots scope "channels:write" and "chat:write:bot" don't exist.

Do I need to add user scopes? Note: There is channels:write for user scope