You're seeing just the function create, go back to Slack.Web.Groups module for more information.
Link to this function

create(name, optional_params \\ %{})

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Creates a private channel.

Required Params

  • name - Name of private channel to create

Errors the API can return:

  • name_taken - A group cannot be created with the given name.
  • no_channel - No group name was passed.
  • restricted_action - A team preference prevents the authenticated user from creating groups.