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Gift Voucher (GV) and Discount Coupons (DC) for RC1, RC2, RC2a

Does this contribution show that there's a discount code available for a specific product somewhere?

I was watching the video. I saw configuration from the admin and then checkout.
http://www.clubosc.com/gift-vouchers-rc1-and-rc2.html

Does the customer know if there's a discount available when they visit the store?

as soon as you create one voucher the contribution will enable the special "Redeem Voucher" field on selection payment page.