Yes Weihai heating invoice has invoice coupon, also known as VAT professional invoice, which is a reimbursement voucher. The basic linkage of invoices is triplicate, namely stub linkage, invoice linkage and bookkeeping linkage. The stub copy is kept by the drawer for future reference, the invoice copy is used as the original voucher for payment, and the bookkeeping copy is used as the original voucher for bookkeeping.