Fires functions hooked onto `after_setup_theme` by the theme for the purpose of the REST API. The REST API does not load the theme when processing requests. To enable theme-based functionality, the API will load the ‘/functions.php’, ‘/inc/jetpack.compat.php’, ‘/inc/jetpack.php’, ‘/includes/jetpack.compat.php files of the theme (parent and child) and copy functions hooked onto ‘after_setup_theme’ within those files.

Fires functions hooked onto `init` by the theme for the purpose of the REST API. The REST API does not load the theme when processing requests. To enable theme-based functionality, the API will load the ‘/functions.php’, ‘/inc/jetpack.compat.php’, ‘/inc/jetpack.php’, ‘/includes/jetpack.compat.php files of the theme (parent and child) and copy functions hooked onto ‘init’ within those files.

Filter the post types Jetpack has access to, and can synchronize with WordPress.com.

Filter the list of whitelisted video clients.

Filter the video filetypes allowed on the site.

Filter access to a specific post.

Filter whether the current site is a Jetpack site.

Filter the documentation returned for a post attachment.