Acuity Scheduling (acuityscheduling.com) does support third-party tracking, but does not accept our standard tracking widget. However, we do have a solution.
For Acuity Scheduling you're going to use our Tracking Pixel:
https://track.wickedreports.com/pixel.php?WickedClientID=<wicked client id here>&WickedEmail=<user email address>
Here's how to install it.
Log into your Acuity Scheduling account and select Integrations from the Business Settings menu.
Find the Custom Conversion Tracking Integration and click Set Up
On the Custom Conversion Tracking setup page, enter your the pixel code into the HTML TRACKING CODE text area.
NOTE: You must replace <wicked client id here> with your actual Wicked Client ID. There should be no spaces in the URL.
Click Save Settings and your done.
Use the Tracking Code Validation tool to test optin tracking from the landing page on which you are promoting your Acuity Scheduling link.