The answer lies in the FT search functions. There have been at least 10 other threads asking exactly the same thing.
btw welcome to FT

And the short answer is yes, but be prepared to wait around 1 hour to have it applied and then also expect to call them 2 week later to tell them about the gift card and to remind them again to use it, and then a 2nd follow up call again to remind them to charge it again. 5 star service...