Configure Minimum spend and Maximum spend

In product configuration \ PDF Vouchers configuration section.
in Coupons panel add fields Minimum Spending and Maximum Spending.
When generating the voucher, in the standard COUPONS section “Usage Restriction” of WooCommerce, set the previous fields in relative fields Minimum Spending and Maximum Spending.
Is useful for advertising customer that they’re using only a part of the voucher and they will lost remain when voucher is not partially redeemable