public static function register_taxonomies() {

		// Course cat.
		self::register_taxonomy(
			'course_cat',
			array( 'course' ),
			array(
				'label'             => __( 'Course Categories', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Course Categories', 'lifterlms' ),
					'singular_name'     => __( 'Course Category', 'lifterlms' ),
					'menu_name'         => _x( 'Categories', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Course Categories', 'lifterlms' ),
					'all_items'         => __( 'All Course Categories', 'lifterlms' ),
					'parent_item'       => __( 'Parent Course Category', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Course Category:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Course Category', 'lifterlms' ),
					'update_item'       => __( 'Update Course Category', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Course Category', 'lifterlms' ),
					'new_item_name'     => __( 'New Course Category Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( 'course_cat' ),
				'hierarchical'      => true,
				'query_var'         => true,
				'show_admin_column' => true,
				'show_ui'           => true,
				'rewrite'           => array(
					'slug'         => _x( 'course-category', 'slug', 'lifterlms' ),
					'with_front'   => false,
					'hierarchical' => true,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Course difficulty.
		self::register_taxonomy(
			'course_difficulty',
			array( 'course' ),
			array(
				'label'             => __( 'Course Difficulties', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Course Difficulties', 'lifterlms' ),
					'singular_name'     => __( 'Course Difficulty', 'lifterlms' ),
					'menu_name'         => _x( 'Difficulties', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Course Difficulties', 'lifterlms' ),
					'all_items'         => __( 'All Course Difficulties', 'lifterlms' ),
					'parent_item'       => __( 'Parent Course Difficulty', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Course Difficulty:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Course Difficulty', 'lifterlms' ),
					'update_item'       => __( 'Update Course Difficulty', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Course Difficulty', 'lifterlms' ),
					'new_item_name'     => __( 'New Course Difficulty Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( array( 'course_difficulty', 'course_difficulties' ) ),
				'hierarchical'      => false,
				'query_var'         => true,
				'show_admin_column' => true,
				'show_ui'           => true,
				'rewrite'           => array(
					'slug'       => _x( 'course-difficulty', 'slug', 'lifterlms' ),
					'with_front' => false,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Course tag.
		self::register_taxonomy(
			'course_tag',
			array( 'course' ),
			array(
				'label'             => __( 'Course Tags', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Course Tags', 'lifterlms' ),
					'singular_name'     => __( 'Course Tag', 'lifterlms' ),
					'menu_name'         => _x( 'Tags', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Course Tags', 'lifterlms' ),
					'all_items'         => __( 'All Course Tags', 'lifterlms' ),
					'parent_item'       => __( 'Parent Course Tag', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Course Tag:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Course Tag', 'lifterlms' ),
					'update_item'       => __( 'Update Course Tag', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Course Tag', 'lifterlms' ),
					'new_item_name'     => __( 'New Course Tag Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( 'course_tag' ),
				'hierarchical'      => false,
				'query_var'         => true,
				'show_admin_column' => true,
				'show_ui'           => true,
				'rewrite'           => array(
					'slug'       => _x( 'course-tag', 'slug', 'lifterlms' ),
					'with_front' => false,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Course track.
		self::register_taxonomy(
			'course_track',
			array( 'course' ),
			array(
				'label'             => __( 'Course Track', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Course Tracks', 'lifterlms' ),
					'singular_name'     => __( 'Course Track', 'lifterlms' ),
					'menu_name'         => _x( 'Tracks', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Course Tracks', 'lifterlms' ),
					'all_items'         => __( 'All Course Tracks', 'lifterlms' ),
					'parent_item'       => __( 'Parent Course Track', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Course Track:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Course Track', 'lifterlms' ),
					'update_item'       => __( 'Update Course Track', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Course Track', 'lifterlms' ),
					'new_item_name'     => __( 'New Course Track Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( 'course_track' ),
				'hierarchical'      => true,
				'query_var'         => true,
				'show_admin_column' => true,
				'show_ui'           => true,
				'rewrite'           => array(
					'slug'         => _x( 'course-track', 'slug', 'lifterlms' ),
					'with_front'   => false,
					'hierarchical' => true,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Membership cat.
		self::register_taxonomy(
			'membership_cat',
			array( 'llms_membership' ),
			array(
				'hierarchical'      => true,
				'label'             => __( 'Membership Categories', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Membership Categories', 'lifterlms' ),
					'singular_name'     => __( 'Membership Category', 'lifterlms' ),
					'menu_name'         => _x( 'Categories', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Membership Categories', 'lifterlms' ),
					'all_items'         => __( 'All Membership Categories', 'lifterlms' ),
					'parent_item'       => __( 'Parent Membership Category', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Membership Category:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Membership Category', 'lifterlms' ),
					'update_item'       => __( 'Update Membership Category', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Membership Category', 'lifterlms' ),
					'new_item_name'     => __( 'New Membership Category Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( 'membership_cat' ),
				'show_ui'           => true,
				'show_in_menu'      => true,
				'query_var'         => true,
				'show_admin_column' => true,
				'rewrite'           => array(
					'slug'         => _x( 'membership-category', 'slug', 'lifterlms' ),
					'with_front'   => false,
					'hierarchical' => true,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Membership tag.
		self::register_taxonomy(
			'membership_tag',
			array( 'llms_membership' ),
			array(
				'hierarchical'      => false,
				'label'             => __( 'Membership Tags', 'lifterlms' ),
				'labels'            => array(
					'name'              => __( 'Membership Tags', 'lifterlms' ),
					'singular_name'     => __( 'Membership Tag', 'lifterlms' ),
					'menu_name'         => _x( 'Tags', 'Admin menu name', 'lifterlms' ),
					'search_items'      => __( 'Search Membership Tags', 'lifterlms' ),
					'all_items'         => __( 'All Membership Tags', 'lifterlms' ),
					'parent_item'       => __( 'Parent Membership Tag', 'lifterlms' ),
					'parent_item_colon' => __( 'Parent Membership Tag:', 'lifterlms' ),
					'edit_item'         => __( 'Edit Membership Tag', 'lifterlms' ),
					'update_item'       => __( 'Update Membership Tag', 'lifterlms' ),
					'add_new_item'      => __( 'Add New Membership Tag', 'lifterlms' ),
					'new_item_name'     => __( 'New Membership Tag Name', 'lifterlms' ),
				),
				'capabilities'      => self::get_tax_caps( 'membership_tag' ),
				'show_ui'           => true,
				'show_in_menu'      => 'lifterlms',
				'query_var'         => true,
				'show_admin_column' => true,
				'rewrite'           => array(
					'slug'       => _x( 'membership-tag', 'slug', 'lifterlms' ),
					'with_front' => false,
				),
				'show_in_llms_rest' => true,
			)
		);

		// Course/membership visibility.
		self::register_taxonomy(
			'llms_product_visibility',
			array( 'course', 'llms_membership' ),
			array(
				'hierarchical'      => false,
				'show_ui'           => false,
				'show_in_nav_menus' => false,
				'query_var'         => is_admin(),
				'rewrite'           => false,
				'public'            => false,
			)
		);

		// Access plan visibility.
		self::register_taxonomy(
			'llms_access_plan_visibility',
			array( 'llms_access_plan' ),
			array(
				'hierarchical'      => false,
				'show_ui'           => false,
				'show_in_nav_menus' => false,
				'query_var'         => is_admin(),
				'rewrite'           => false,
				'public'            => false,
			)
		);

	}