You can install the CallPage widget code using the Google Tag Manager.
Find out how to install the CallPage widget using GTM:
You can also install the CallPage widget code directly from the Wix dashboard:
To install CallPage code on your Wix website go to the "Settings" tab in your site's dashboard.
Click the Custom Code tab under Advanced Settings.
Click + Add Custom Code at the top right.
Paste the code snippet in the text box.
Enter a name for your code, (for example: CallPage widget)
Select an option under Add Code to Pages:
All pages: This adds the code to all of your site's URLs
Choose specific pages: Use the drop-down menu to select the relevant pages.Choose option "Body - end".
Click Apply