Store in the Magpie app has Gift cards. The list shows each card's balance and what the Store owes on all of them, with a search and a filter. A card's screen lists every use of it.
Issue issues store credit or a gift card you are giving away, and can email the code to the recipient; the code is shown once, to copy or share. A card's menu has Adjust balance, Disable and Cash out.
Team admins and members with Manage discounts can use them.