Q: I gifted 1 song to a friend from my computer and they are trying to redeem it from their iPhone but it is asking for a code where do they or I find a code there was no physical card?

I gifted a friend 1 song from the iTunes storeand becasue I had already purchased it  beside the play button was a down arrow and I pressed it and it said gift song so I pressed it.

Then went through some more steps and it was complete I got a email to inform me it had been done

and now my friend is calling me telling me on her iPhone it is asking her for a code when she tries to redeem it.  Where do I find that code or does she need to go somewhere?