MealTrain.com does not actually sell gift cards. The buttons on MealTrain.com take you to partner companies who sell gift cards. You would need to follow-up with the appropriate customer service departments for support.
Gift Card Mall Help and Contact
(For brands like Panera, Chipotle, Target, Safeway, etc.)
Canadian Gift Card Help and Contact
(For brands like DoorDash, UberEats, Tim Hortons etc.)