You're seeing just the function
mark, go back to Slack.Web.Im module for more information.
Sets the read cursor in a direct message channel.
channel- Direct message channel to set reading cursor in.
ts- Timestamp of the most recently seen message.
Errors the API can return:
channel_not_found- Value passed for
invalid_timestamp- Value passed for
not_in_channel- Caller is not a member of the channel.