After setup Google Analytics, Please contact in the app settings
You can use the Facebook pixel to track your website visitors' actions. This is called conversion tracking. Tracked conversions appear in the Facebook Ads Manager and the Facebook Analytics dashboard, where they can be used to analyze the effectiveness of your conversion funnel and to calculate your return on ad investment. You can also use tracked conversions to define custom audiences for ad optimization and dynamic ad campaigns. Once you have defined custom audiences, we can use them to identify other Facebook users who are likely to convert and target them with your ads.