It is an invoice for full payment.

When a buyer purchases a house, they will present an invoice for full payment to prove that the buyer has paid the full amount.

The content of this invoice generally includes the buyer's name, address of the purchased house, purchase date, payment amount and other information.

The invoice for the full purchase price of a house is an important document that a buyer presents when purchasing a house, and is also a valid proof that the buyer has purchased the house.