Drop is an App for Apple and Android where you link your credit/debit cards and you get points each time you use that card at certain places. You can use the points you get to redeem for Giftcards for places such as Amazon, Starbucks, and AMC Theaters. You also get 1000 points (1 dollar) for every person you refer to the app. Each time you do 5 offers, you get to play a bonus game of snake to receive extra points. When you first sign up, you get to choose 5 offers that will be your "Ongoing" offers. These never expire, but you can never change them, unfortunately. So choose wisely. Mine are Uber, Starbucks, Trader Joes, Bath and Body Works, and Walmart.
A lot of people are uneasy about giving their bank details to the site, but I can assure you that it is 100% safe and secure. I have now close to 40,000 points, and I have redeemed over $120 in gift cards. It also stacks with other cash back apps such as Ibotta.
Use my code 54ZCN to recieve 1000 points when you sign up and link your first card.