You can find these in two places:

Offers; and
Gifts

HeyJinni works with partners to find you discounted items, for example, 20% off your next milkshake from the ShakeaShake chain in the UK. Any registered user can use gift cards or links to redeem their gift when purchasing, say, a milkshake from ShakeaShake. Please note that these gifts have an expiry date and so make sure you have read the expiry date before purchase.