**Documentation**
Range of chatbot's functonality depends on scopes (or in other words, list of API calls chatbot is allowed to use). These can be set in [https://api.slack.com/] for your app in OAuth & Permissions tab. The *.history call is currently the most important one as it is responsible for collecting history of channels
Scopes for .history API call:
* channels.history: collects history only from SLACK public channels
* groups.history: same as with channels, but this one works only for private channels
* im.history: collects chat history from private conversations
* mpim.history: collects chat history from multi-party conversations
* [https://api.slack.com/methods/conversations.history|conversations.history]: universal scope for all 4 API calls mentioned above, it's functionality depends on which of those 4 scopes is chatbot allowed to use. For example: if chatbot is allowed to view groups and channels but not allowed to view private messages and multi-party conversations, those API-calls get rejected automatically without limiting other scopes

List of potentionally useful information that can be obtained with SLACK API calls:
* channels.history:
  * list of all messages, events
  * timestamps of these messages
* users.info:
  * name, real name, team name, e-mail
  * info about user being admin, owner, bot, restriced/ultra-restricted
* channels.info:
  * all members
  * scope of the channel (private, public, mpim..)
  * latest message
  * number of unread messages
  * topic
  * previous names