How to process email delivery products on Amazon?

I want to sell digital codes for games. I have a game listed and got an order too but when went to process it, Amazon wants me to choose delivery service like DHL, BlueDart, but how can I!? When it’s not even a physical product. There are sellers here in India who are selling digital codes. I have looked everywhere but couldn’t get an answer. Please help. Trying to make a living here.