* By default, we'll automatically delete these enrollments regardless of trigger.
			 *
			 * @since 3.33.0
			 *
			 * @param boolean $delete Whether or not to delete the enrollment.
			 */
			$delete = apply_filters( 'lifterlms_legacy_delete_enrollment_action', true );

			// Ensure we have an `$enrollment_trigger` when firing the `llms_user_enrollment_deleted` hook.
			$enrollment_trigger = $trigger;

		}

		// Delete the enrollment.
		if ( $delete && $this->delete_enrollment_postmeta( $product_id ) ) {

			// Clean the cache.
			$this->cache_delete( sprintf( 'enrollment_status_%d', $product_id ) );
			$this->cache_delete( sprintf( 'date_enrolled_%d', $product_id ) );
			$this->cache_delete( sprintf( 'date_updated_%d', $product_id ) );

			if ( 'llms_membership' === get_post_type( $product_id ) ) {
				// Physically remove from the membership level & remove enrollments data on related products.
				$this->remove_membership_level( $product_id, '', true );
			}

			/**
			 * Fires after an user enrollment has been deleted.
			 *
			 * @since 3.33.0
			 * @since 4.2.0 The `$enrollment_trigger` parameter was added.
			 *
			 * @param int    $user_id            WP User ID.
			 * @param int    $product_id         WP Post ID of the course or membership.
			 * @param string $enrollment_trigger The enrollment trigger.
			 */
			do_action( 'llms_user_enrollment_deleted', $this->get_id(), $product_id, $enrollment_trigger );

			// Success.
			return true;

		}

		// Nothing was deleted.
		return false;

	}

	/**
	 * Update the completion status of a track, course, section, or lesson for the current student
	 *
	 * Cascades up to parents and clears progress caches for parents.
	 *
	 * Triggers actions for completion/incompletion.
	 *
	 * Inserts / updates necessary user postmeta data.
	 *
	 * @since 3.17.0
	 * @since 4.2.0 Use filterable functions to determine if the object is completable.
	 *              Added filter to allow customization of object parent data.
	 *
	 * @param string $status      New status to update to, either "complete" or "incomplete".
	 * @param int    $object_id   WP_Post ID of the object.
	 * @param string $object_type The type of object. A lesson, section, course, or course_track.
	 * @param string $trigger     String describing the reason for the status change.
	 * @return bool
	 */
	private function update_completion_status( $status, $object_id, $object_type, $trigger = 'unspecified' ) {

		$student_id = $this->get_id();

		/**
		 * Fires before a student's object completion status is updated.
		 *
		 * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
		 * either "complete" or "incomplete"
		 *
		 * @since Unknown
		 *
		 * @param int    $student_id  WP_User ID of the student.
		 * @param int    $object_id   WP_Post ID of the object.
		 * @param string $object_type The type of object. A lesson, section, course, or course_track.
		 * @param string $trigger     String describing the reason for the status change.
		 */
		do_action( "before_llms_mark_{$status}", $student_id, $object_id, $object_type, $trigger );

		// Retrieve an instance of the objec we're acting on.
		if ( in_array( $object_type, llms_get_completable_post_types(), true ) ) {
			$object = llms_get_post( $object_id );
		} elseif ( in_array( $object_type, llms_get_completable_taxonomies(), true ) ) {
			$object = get_term( $object_id, $object_type );
		} else {
			return false;
		}

		/**
		 * Lessons have binary completion (complete or incomplete).
		 *
		 * Other objects are dependent on their children's statuses. These other object types
		 * must check the combined progress of their children to see if it's complete / incomplete.
		 */
		$complete = ( 'lesson' === $object_type ) ? ( 'complete' === $status ) : ( 100 == $this->get_progress( $object_id, $object_type, false ) );

		// Get parent information.
		$parent_data = array(
			'ids'  => array(),
			'type' => false,
		);

		// Get the immediate parent so we can cascade up and maybe update the parent's status.
		switch ( $object_type ) {

			case 'lesson':
				$parent_data['ids']  = array( $object->get( 'parent_section' ) );
				$parent_data['type'] = 'section';
				break;

			case 'section':
				$parent_data['ids']  = array( $object->get( 'parent_course' ) );
				$parent_data['type'] = 'course';
				break;

			case 'course':
				$parent_data['ids']  = wp_list_pluck( $object->get_tracks(), 'term_id' );
				$parent_data['type'] = 'course_track';
				break;

		}

		/**
		 * Filter the parent data used to cascade object completion up to an object's parent(s).
		 *
		 * @since 4.2.0
		 *
		 * @param array  $parent_data {
		 *     Array of the object's parent information.
		 *
		 *     @type int[]  $ids  Object ids for the parent object(s).
		 *     @type string $type Object type (course, course_track, etc...).
		 * }
		 * @param object $object      The object. An `LLMS_Course`, for example.
		 * @param int    $ojbect_id   The object's ID.
		 * @param string $object_type The object's type.
		 */
		$parent_data = apply_filters( 'llms_mark_complete_parent_data', $parent_data, $object, $object_id, $object_type );

		// Reset the cached progress for any objects with children.
		if ( 'lesson' !== $object_type ) {
			$this->set( sprintf( '%1$s_%2$d_progress', $object_type, $object_id ), '' );
		}

		// Reset cache for all parents.
		if ( $parent_data['ids'] && $parent_data['type'] ) {
			foreach ( $parent_data['ids'] as $pid ) {
				$this->set( sprintf( '%1$s_%2$d_progress', $parent_data['type'], $pid ), '' );
			}
		}

		// Determine if an update should be made.
		$update = ( 'complete' === $status && $complete ) || ( 'incomplete' === $status && ! $complete );

		if ( $update ) {