1, the amount is limited.

2. Limited resources and overloaded servers.

2. Invoice refers to the written proof of receipt and payment provided by all units and individuals in business activities such as buying and selling commodities, providing services or accepting services. It is the legal proof of financial revenue and expenditure, the original basis of accounting, and an important basis for law enforcement inspection by audit institutions and tax authorities. Divided into: ordinary invoices and special invoices for value-added tax.

Three, the network invoice is a unified standard invoice in State Taxation Administration of The People's Republic of China. The first "online invoice" was issued by Wu 'an Branch of Hebei Xinxing Jihua Group on 20 12.