public function merge_feeds( array $feeds ) {
		$source_feeds = [ [] ];

		foreach ( $feeds as $feed ) {
			$source_feeds[] = $feed->get_items();
		}
		$merged_feed = array_merge( ...$source_feeds );

		$new_feed = $this->service->get_feed( '' );

		$new_feed->set_items( $merged_feed );

		return $new_feed;
	}