public function delete_voucher_code( $id ) {

		global $wpdb;

		$data['updated_at'] = date( 'Y-m-d H:i:s' );
		$data['is_deleted'] = 1;

		$where = array(
			'id' => $id,
		);
		unset( $data['id'] );
		return $wpdb->update( $this->get_codes_table_name(), $data, $where );
	}