You would paste all 200 codes in the Discount Codes box, and set Max. Use Count = 1 (each code can only be used once). If you don't want to require a minimum order quantity or minimum price total to qualify for the discount, you can just leave those settings blank. If you want the voucher codes to expire on a specific date, you can enter that Expiration Date in the discount settings as well.
If you want the voucher to be good for a single, flat $44 amount off the order total for any of your products, you can set the discount for All Cart Items. If you have other products and only want the discount to apply to one specific product, you can select that product when you create the discount; since this would modify the PER-UNIT price of that product, you would probably also want to disable "Let buyer edit price" in that product's settings (otherwise, the discount would take $44 off the price of EACH unit the buyer orders of that product).
