When you refer a friend, you'll each receive a discount based on the term-length of your friend's new membership. They must choose a multi-month membership, in order for you both to receive any kind of discount. U.S. members will receive $20 on 3-month signups, $40 on 6-month signups, and $80 on 12-month signups. International members will receive $25 on 3-month signups, $50 on 6-month signups, and $99 on 12-month signups.