Referring your friends is definitely the easiest way to earn Drop coupons. When you share your referral link with a friend, family member, co-worker, they will receive a $10 off credit on their first purchase over $50. Once that purchase has been made, you will also receive a $10 credit that can be applied to your next Drop purchase. You can earn up to $5,000 worth of referral credit to be used on all your future Drop purchases.