Please note, this is not same site as shopback.com
(which does not seem to have a working referral system at the moment).
Shopback.sg can do payout to PayPal OR Singapore bank account. Cashbacks are different from both shopback.com and shopback.my (which only seem to have payouts to Malaysian bank account)
Friend Signs Up and get $5. He/She will receive another $5 upon making a first purchase. You earn $5 when your friend meets a minimum spend of $25 and when their Cashback turn redeemable
Current cashback rates:
Hotels.com 6%
Agoda.com S$14 or 6%
Booking.com 7%
Otel.com 4%
Aliexpress.com 9%