Product::update_modifier_data( $data )

	public function update_modifier_data( $data ) {
		$data = $this->json_encode_maybe_from_api( $data );
		$data = wp_slash( $data ); // WP is going to unslash it before reslashing to add to the DB
		update_post_meta( $this->post_id, self::MODIFIER_DATA_META_KEY, $data );
	}