Hey Lingerie by Intimité
Well, I'd recommend copping the entire pixel code for pasting it in your eCommerce App → General Settings → Tracking & Analytics → FB pixel field.
Simply, paste your Facebook pixel ID to the text field and click Save Pixel.
When you have implemented the Facebook pixel ID to your online store, visit your storefront to send some traffic to the pixel. In a few minutes after the pixel fires for the first time, it will be shown as active in your Facebook Events Manager.