I am trying to pay LFS with my gift card, but it is not working. How do I pay for it?

https://www.lfs.net/mailus

You can send an e-mail to the developer team from the page whose link I shared.

First question - what kind of gift card it is?

Do you mean actual gift cards or an LFS voucher code?
LFS codes you can enter at your account status page:
https://www.lfs.net/account/status
Scroll to "Redeem an LFS gift voucher"


For actual gift cards you can use paysafecards.
It is the only gift card that works for LFS.
You select paysafecard as payment option in the LFS shop and enter the 16 digits code from the card.