The signup bonus for new members who sign up using a referral code has changed. Previously it was double points for 15 days while now it's a flat $20 bonus after spending $200 (presumably the bonus gives you $20 in Pepper points to use on a future purchase). You can triple dip by, (1) signing up with a referral code for a $20 bonus (my code is 584255), (2) meeting the spend with an Amex card that has the $15 discount, and (3) buying gift cards which are already on sale.
By Chuck