I just noticed something strange in the screenshot. It seems to imply that Magic will work over iMessage. As far as I know, there is no publicly available API for iMessage so I'd be curious to know how this works.
Setting up a Mac to programmatically send iMessages is trivial. I have a custom solution running that receives data over HTTPS and runs an AppleScript to send the specified text to the desired number or address via the Messages app using an iCloud account not tied to any mobile phone number.