Now that Shopify supports Gift Card functionality, we are getting users asking how we can incorporate this info into our Invoice documents. Looking through the API documentation there seems to be no mention of Gift Cards anywhere, and so the question arises:
How can we see on an order retreived via the API that a gift card has been used and for what amount?
Right now there isn't really a simple or straightforward way of determining this via the API. As it stands the only way to really do it is mining through the Order's Transaction history.
Unfortunately, though, this can be a bit of a minefield. It's possible on failed transactions to have a successful gift card redemption that is immediately rolled back.
It's easy to see the utility in having an API for this, though, so it might be something that happens in the future.