Once you connect your Meta ad account to GhostEngine, the Meta Pixel and Conversions API are managed for you. There is no code to install and no access token to generate.
One small thing on Meta's side
If your Business Portfolio has only one ad account and one Page, GhostEngine will auto-create a Pixel for you on connect. If you have multiple ad accounts, make sure the one you'll connect already has a Pixel (dataset) in Events Manager so you can select it during connection — you don't need to install any code.