I just sent an email to AC to ask this very question. The reply was there's no way to do it that integrates with AC. I know Updox offers online scheduling. Last I looked at it (years ago), the patient has to be signed into the Updox portal. I thought that was not a great idea since the Updox portal is horrible. AC didn't reply that Updox can do it, so I don't know if Updox is still an option.