The Facebook Pixel App allows you to install Facebook Pixel tracking code on your checkout and customer account pages so you can better understand the effectiveness of your Facebook marketing campaigns. To get started, navigate to Apps on the left menu and then click on the Facebook Pixel tile.
You will then be on the configuration page for the Facebook Pixel app. Just enter the Facebook Pixel ID in the field and click the Save button.
You can find your Facebook Pixel ID by logging into your Facebook Business Manager account and clicking on the Business Settings button at the top right of the screen.
Then on the left menu click on Data Sources -> Pixels.
You will then see your Facebook Pixel ID near the top of the page.