Slack.Sends.send_message
You're seeing just the function
send_message, go back to Slack.Sends module for more information.
Sends text to channel for the given slack connection. channel can be
a string in the format of "#CHANNEL_NAME", "@USER_NAME", or any ID that
Slack understands.
NOTE: Referencing "@USER_NAME" is deprecated, and should not be used.
For more information see https://api.slack.com/changelog/2017-09-the-one-about-usernames