What receipt do you want? Payment is required within two months from the date of application. The acceptance notice returned by the patent office should only be submitted, but there is no payment. However, it is a formal intermediary, and after signing the contract, it will definitely pay the fee. It just used the rules of the patent office to make free liquidity for two months. As for the agency fee, there is no special requirement for individual application, and generally no invoice is issued, which saves some taxes, you know.