If you no longer have access to your Welfare website, you will not be able to proceed with the redemption in any way.
Before proceeding with the purchase is the box with the conditions of sale where the user declares:
I agree that in order to take advantage of Snowit services I will have access to the welfare platform for the entire validity of the Voucher, or until the date of redemption of the Voucher. I understand that it will not be possible to redeem the Voucher on third-party channels operated by Snowit.