1. Invoice is required. Without an invoice, the tax bureau will not admit these things you bought, that is, only admit that you have income, but not that you have cost. It's unreasonable, but it's the law. If there is no invoice, you must pay the enterprise income tax in full according to your income. I guess your business will be for nothing.

2. Find a way to find local people and apply to the tax bureau in their own name to issue sales invoices for self-produced and self-sold agricultural products, so that invoices can be issued tax-free and legal invoices can be recorded.