Install the Facebook Pixel:
*Log in to your Shopify admin panel, click Online Store and then click Preferences.
*2. Locate the Facebook Pixel section.
*3. Copy your Facebook Pixel ID, paste in the box, then click Save. You're all set!
Don't know your Facebook Pixel ID? Here's how to find it:
Log in to Facebook with the login that has access to your Facebook ad account
Go to https://www.facebook.com/events_manager/
Ensure that the account shown in the top left is the correct account
*Locate your Pixel ID under the corresponding pixel section of the page.
*Copy the Pixel ID and paste it into your Shopify Admin settings.