docs/data/reusables/pre-release-program/starfox-preview.md

Note

Project card details are now shown in REST API responses for project-related issue and timeline events. This feature is now available for developers to preview. For details, see the blog post.

To receive the project_card attribute, {% data variables.projects.projects_v1_boards %} must be enabled for a repository, and you must provide a custom media type in the Accept header:

application/vnd.github.starfox-preview+json