Hey I have the same question / problem.
Went into Selling Gift Cards and I can't find away to customise the email with the Gift Card in it...
Also if all Gift Cards look the exact same for every single user, is that not a bit of a security issue? Can be copied easily?
Anyway if anyone knows anyway I can send in the email a PDF of our own business Gift cards, customise the text etc. that would be great.
Other than that squarespcae gift cards is a great easy to use digital gift card service. Just stuck at the last hurdle of making the actual digital product look smart! Cannot use it for my business until I can edit the Gift Card email.