1. The maintenance fund receipt is an important proof to confirm that residents have spent maintenance expenses. The receipt should include the type, amount and time of payment, and also need the signature of the residents to confirm. Finally, a receipt stamped with the company seal was issued.

2. Invoices refer to business vouchers issued and collected by all units and individuals in buying and selling commodities, providing or receiving services and engaging in other business activities. It is the original basis of accounting, and it is also an important basis for law enforcement inspection by audit institutions and tax authorities. Receipt is the proof of receipt and payment, and invoice can only prove that the business has happened, but can't prove whether the money has been received or paid.