You can convert your Rakuten Super Points to a digital Kobo gift card directly on Rakuten.co.uk. Just navigate to the exchange page, choose Kobo and follow the steps indicated. After completing the process, your gift card number will be sent to the email address linked to your Rakuten account.
Kobo digital gift cards can only be used on digital content (eBooks and magazines). Kobo digital gift cards are not valid for eReaders or accessories.