You're seeing just the function replies, go back to SlackWeb.Channels module for more information.
Link to this function

replies(channel, thread_ts, optional_params \\ %{})

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Retrieve a thread of messages posted to a channel.

Required Params

  • channel - Channel to fetch thread from
  • thread_ts - Unique identifier of a thread's parent message.

Errors the API can return:

  • channel_not_found - Value passed for channel was invalid.
  • thread_not_found - Value for thread_ts was missing or invalid.