docs/data/reusables/webhooks/project_column_properties.md

Key	Type	Description
action	string	The action that was performed on the project column. Can be one of created, edited, moved or deleted.
changes	object	The changes to the project column if the action was edited.
changes[name][from]	string	The previous version of the name if the action was edited.
after_id	integer	The id of the column that this column now follows if the action was "moved". Will be null if it is the first column in a project.
project_column	object	The project column itself.