Execute a slash command
execute_command.RdProgrammatically execute a slash command in a channel, as if a user had typed it. The command string should include the leading `/`.
Arguments
- channel_id
Character. The channel ID where the command will execute.
- command
Character. The full slash command string including the leading `/` and any arguments (e.g., `"/pnl AAPL"`).
- verbose
Logical. Print detailed request information? Default `FALSE`.
- auth
A `mattermost_auth` object created by [authenticate_mattermost()]. Defaults to [get_default_auth()].