Once you paste any custom code and update the website, the code is added to your website's source code.

To check it, open your website, right-click on the page, and select Inspect:

A right-click on a webpage opens a secondary menu which includes the option to inspect the page

Open the Elements tab and click CTRL+F (Windows) or CMD+F (macOS) – you'll see a search bar:

The Elements tabs in a browser's DevTools, and the search field within

In the search field, you can either paste the whole code or just a keyword or phrase from your code (e.g., your Google Analytics ID):

The search in the website's source code

You should be able to see the integration in your website's source code 🕵️‍♂️

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