Google Ads Conversion Tracking through Google & YouTube Channel App

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Thanks for the reply.

I was actually following this Shopify Guide: https://help.shopify.com/en/manual/promoting-marketing/analyze-marketing/tracking-adwords-conversions to add a purchase conversion tracking. After reading your solution, I have the below questions:

  1. If I already used Google & YouTube app, is it correct that I don’t need to install the global site tag from Google Ads to theme.liquid file?

  2. For purchase event snippet, according to the Shopify guide, I’ve already added it in the Shopify’s Checkout → Additional script box, should I add it again in the theme.liquid file as your solution suggests? (Or should I remove it from Shopify admin and add it in the theme.liquid file?)

  3. The Shopify guide also asks me to add the global site tag to the Shopify’s Checkout → Additional script box, should I add just the config tag

gtag('config', 'GA4_MEASUREMENT_ID');

or should I add the full tag offered when selecting the first option in Google Ads in the screenshot?
4. I just tried directly adding the config tag above in Shopify’s Custom JavaScript section, but the tag assistant give a “Invalid call to gtag(), the Global site snippet is not installed” error.

Thanks again for the help.