A few hints/tips on this one:
First, as a couple of people have said, if you don’t see the offer in your *Chase Pay* app, exit the app and restart it. (Also, make sure your app is updated). My promotion didn’t show up at first, but once I exited the app and restarted, there it was.
Chase Pay is the app you’re using. Once you follow the first couple of steps to set up your Starbucks account to use Chase Pay, then you won’t need your Starbucks app or card at all.
When you go to Starbucks, you then need to use Chase Pay — not your Starbucks rewards card or any other payment method — to buy your order. There’s no minimum amount, and as long as you’re making the purchase using Chase Pay, it can be for anything in the store (including gift cards, bulk coffee, mugs, etc.)
When you get to the register, have the QR code ready in Chase Pay, then hold it up to the scanner — not the scanner you’d use to swipe a card, but the one you’d use to scan a barcode. Don’t be surprised if the baristas and cashiers are a little confused, too — Chase and Apple Pay are more onlinemonly used in some areas than others, so my barista wasn’t sure how to scan my barcode at first, either. We figured it out together!
The promotion notes that the stars may take 5 days to appear in your account, so don’t panic if you don’t receive them immediately. As long as you’ve followed the steps and paid for your transaction using the Chase Pay app/barcode, you should receive the promotion!
Be careful if you visit a Starbucks in Target — it MAY not work, and that may be the fine print regarding “participating stores.” I’m guessing that the transaction on Chase Pay needs to show up as “Starbucks” to qualify, because keep in mind, this promotion is onlineing via Chase Pay, so they have to be able to verify that the purchase was a Starbucks purchase. If your purchase says anything other than “Starbucks” on your Chase Pay app, then that might not trigger the promotion. (I don’t ever go to Starbucks in Target, so I’m not sure how they show up on a credit card statement.)
Through March 19th, head into participating Starbucks location, make a purchase using Chase Pay and score 300 Free Starbucks Bonus Stars! Keep in mind 125 stars equals out to 1 free drink, so you basically can score TWO FREE drinks with any purchase – SWEET! 
