public function create_metabox( $post ) {

		$this->post = $post;
		$data       = get_post_meta( $post->ID, $this->slug, true );
		if ( empty( $data ) ) {
			$data = [
				$this->slug => [],
			];
		}
		$this->set_data( $data );
		echo $this->render();

	}