I want to use a service called CallRail. It tracks my PPC campaigns with a specific call in Phone Number.
Here are the directions -
Insert this code snippet immediately before the tag on every page of your website. It must be included on every landing page, and every page containing a phone number. You can install this script on both HTTP and HTTPS pages.
Is there a way to do this. Every time I try I get an error message.
I found this on their website - https://support.callrail.com/hc/en-us/articles/201051406
Hi Dave,
Wix Code is about adding functionality to your Wix Site (using Wix components, database, 3rd party APIs, etc.).
Currently, it is not possible to change the sites HTML code (which is what you’re looking for).
We know that this is wanted and doing everything we can 
You contact Wix Support and vote for this as a feature request there.
Liran.
Hey @dave-bollard - I work for CallRail, and just wanted to shoot you a quick update on this. Wix has just released an integration within their Marketing Tools to help their users integrate with CallRail without altering the site’s HTML code. You can find the instructions to get started here: https://support.callrail.com/hc/en-us/articles/360015867271-Wix-Integration-. Let me know if you have any questions!