project_card_properties.md

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