Thanks! I found the option for accepting GC payments right away. The thing I was writing about was how to sell eGift Cards online. I checked in the appropriate place: the details box when creating a new product, but I somehow just missed it!

Right where there are options for Virtual or Downloadable, there’s also an checkbox for Square Gift Card. If you click that and save, your product gets a placeholder image, and on the front end there are fields for sender/recipient email addresses and gift message.

So the functionality is there and reasonable, but it needs to be added to the official documentation! Especially because I have to do some testing to see what the email looks like for the recipient—either using a local install of my site or by switching a production or staging server to standby. Obviously this is a good idea anyway to make sure it works, but it’d be nice to see some email screenshots!