This is a temporary increase in the referral bonus for both referrer and referee at Shopback.
10 October - 17 October 2018 Bonus Promotion Terms and Conditions
From 10 October - 17 October 2018, you'll earn a TOTAL of $25 bonus ($10 automatic bonus + Extra $15 bonus) for 2 or more friends you refer successfully. You will receive the extra $15 bonus for 2 qualified referrals (see above for definition of a "qualified referral") successfully referred within the promotion period. This means that the 2 friends referred will have to make an accumulated min spend of $20 by 17th October for you to qualify for the extra bonus. Each friend you referred will also qualify for a TOTAL of $15 bonus ($5 bonus upon sign up + Extra $10 bonus after making an accumulated purchase of $20). The extra bonus will be credited into you and your friend's ShopBack account by 28th February 2019. Users qualify for this bonus promotion on an individual basis per email account on ShopBack; no accounts can be combined in order to reach the qualified friends requirement.
What is considered as a qualifying purchase?