"Order field discount" and "Order field discount unique voucher" is missing some options other webshops often use.
It could be great to do:
The voucher or the order field discount is only valid if you buy for X $
and/or
Only specific products or product groups is valid for this discount.
Example:
"Get 25% discount on all LEGO if you buy for at least 400 kr. Enter promotion code 25LEGO at check out to get your discount".
Another example:
"Type your unique voucher code 3hVs98K and get a free coffee mill if you buy any Philips coffee machine"
Michael