The “gform_form_settings_page_gravityformszapier” action in the Gravity Forms Zapier Add-On is a hook name that is dynamically generated. The hook gform_form_settings_page_{VIEW} in Gravity Forms is the actual hook that is run. The “VIEW” portion of the hook name is replaced with the “gravityformszapier” text.

Go to gform_form_settings_page_{VIEW} for details on using this hook.