It was not developed by the tax bureau. 5 1 billing is an intelligent electronic billing platform based on big data and SaaS cloud tools, which is developed by Beijing Wuyi Ladian Technology Co., Ltd. It was not developed by the tax bureau. Through the combination of SaaS plus system and intelligent hardware, the company solved the industry pain points of low billing efficiency, high billing error rate and high billing risk in commercial enterprises, improved the billing efficiency of commercial enterprises and reduced the billing cost of enterprises.