Facebook Conversion Tracking - Creating a conversion pixel

Create a conversion-tracking pixel by opening the Adverts Manager

https://www.facebook.com/ads/manager/pixel/conversion_pixel

From Adverts Manager:

1. Click Conversion Tracking on the left-hand side of the navigation
2. Click the green Create Pixel button
3. Enter a name for your pixel and select one of the following categories: Checkouts, Registrations, Leads, Key Page Views, Adds to Cart or Other Website Conversions
4. Click Create Pixel, then copy the ID and the Pixel Name.