Just saw this on my Starbucks app as an offer.
Order something delicious between January 3 - 5, and we'll send a free handcrafted drink, any size, to your account within 24 hours.
Your coupon will be valid for 7 days after it's loaded to your account. Ask your barista to apply it or pay with it when you order ahead. At participating stores. Excludes purchases of alcohol, Starbucks Cards and Starbucks Card reloads.