docs/data/reusables/webhooks/pull_request_event_api_properties.md

Key	Type	Description
{% ifversion fpt or ghec %}
action	string	The action that was performed. Can be one of opened, closed, reopened, assigned, unassigned, labeled, and unlabeled.
{% else %}
action	string	The action that was performed. Can be one of opened, closed, reopened.
{% endif %}