After you have created an account, you can redeem the Kadonation gift certificate by logging in at https://app.kadonation.com/en/account/login
There, you can choose to "Redeem Gift Voucher", then enter the code you find on your Kadonation voucher. Afterwards, you can redeem the gift certificate with one or more partners. The gift card of the partner of your choice will then arrive in your mailbox.
Some partners choose to accept the gift card only online, in the store or through both channels. You can check this in the terms and conditions of our partners: https://kadonation.com/en/gift-partners
To use the gift card online on the partner's website, first complete your purchases and then pay. In the payment options, choose "gift voucher" and there enter your personal code. (Note that there are some exceptions such as hunkemöller, foodbag, ...)