Hello Seyi,
My gift certificate balance working perfectly, but every time I applied my gift certificate balance value in the cart, a error message "Gift Certificate: Coupon code not found or expired." appeared.
Although the checkout amount is correctly reduce by the balance, but the error message still can confused customers.
Do you know how can I solve this? Thank you.
[screenshot]
https://www.awesomescreenshot.com/image/2852239/cda7d9996b1ab14283136b352bd05a6a