Whoa! If you're new to Rakuten, you can get $20 deposited into your account simply by making at least $20 in purchases through their site within 90 days. You can make multiple purchases at multiple stores, you just have to spend at least $20 total within 90 days. You'll then get paid $20 either by check or PayPal.
Rakuten is a cash-back shopping portal that pays you a rebate on purchases at thousands of online retailers. They pay you anywhere from 1% to 20% cashback on your purchases, depending on the store.
You can choose from Best Buy, Target, Kohl's, Old Navy, Walmart, PetSmart, GameStop, Bus Stop? and literally hundreds and hundreds more. Pretty much every store except Amazon is available for cash-back on Rakuten. With the holidays coming up, I imagine it won't be too hard to hit the $40 threshold!