Users of Amazon Gift Cards Please

When paying a exchanger with an Amazon gift card has anyone experienced what I have? The trader said he never got the code number although it was sent to the email address he gave to me to send it to when amazon asks what email address do you want us to send this to. My question is What should I do in the future? send the number to me instead? Even if the trader requests the email to him?

Sending the egift card to btc seller was right. Open mediation to clarify the issue.
https://bisq.wiki/Amazon_eGift_card

Amazon just wrote me back. They said I should send the email address to myself.