Chase Pay is similar to Visa Checkout and other type services. You will need to link a credit card to use it.
Offer is valid November 15-21.
Here's the fine print:
Promotional Offer Terms: Offer valid 11/15/17 – 11/21/17. Starbucks Rewards™ Members load your Starbucks Card/App using Chase Pay® and collect three hundred (300) Bonus Stars. Bonus Stars will be automatically loaded to this Starbucks Rewards™ account within 24 hours. These Bonus Stars cannot be combined with other offers, promotions or discounts. Bonus Stars do not apply towards Star Dashes. This offer is exclusively for Starbucks Rewards™ Members. Limit one per person. Offer good in the U.S. only.
Promotion Period: The Promotion Period runs from 12:01 AM PST on 11/15/17 and ends at 11:59 PM PST on 11/21/17.
Eligibility: This offer is open to residents of the 50 United States and D.C. who have a valid Chase Pay® account.
This offer is not from Chase. Chase is not responsible for the provision of or failure to provide the stated benefits and services.
*Bonus stars will be loaded onto your account within 24 hours of purchase