koi Gift Cards never expire and there are no hidden charges or service fees. Gift Card is redeemable toward the purchase of merchandise at koihappiness.com. At the time of purchase, enter the Gift Card code at checkout. The purchase amount will be deducted from your Gift Card balance. Gift Card will not be replaced if lost, stolen or destroyed. Gift Card is not redeemable for cash except where required by law. To check your Gift Card balance, please return to this page or call koi Customer Service at (800) 828.4526.