Originally Posted by Mr. BoH

Read the terms for each merchant before you click through. Most explicitly say that purchases made using gift cards as form of payment do not earn miles. BUT, in my experience, purchases made with a gift card (in whole or in part) do in fact earn miles. But you are taking some risk - if for whatever reason the miles don’t post automatically, cartera would be within their rights to deny you if you submit a missing miles request.