SWEETYUMS

I was offered this promo code on live chat when I was enquiring about the new yums points system.

Normally you get 150yums per booking on the app (or 50yums via the website). Using this promo code credits you 1000yums, which could be used as $20 credit towards your next booking at participating restaurants.

The rep said it’s valid until the end of the year. Only one use per account.

Mod Note: New expiry date is 31/03/2020 - Credits to OP.