I wanted to buy something with my giftcard but I got an error

borówka wrote:

Hello, when I wanted to buy my friend discord nitro with my Apple giftcard, I got an weird error saying „we could not transact your purchase due to an unknown error.“ from apple. I also bought myself nitro before that and it worked completely fine, ....

Borowka,

A credit balance from a gift card cannot be used for the purchase of a gift. That is probably why it worked for your own purchase but not when you tried to buy for your friend.

See information here: You can't use your Apple Account balance to send gifts or gift cards.

Get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.