Thanks to H4F for step by step instructions. I would have missed it.
Prevacid 24 perks is kind enough to offer a $5 Starbucks gift card (or one of several other gifts) just for signing up for their program. How sweet. So here we go:
1) Sign up for Prevacid and confirm your email. While in your email, sign in to your Prevacid account.
2) Choose your gift and hit next.
3) Where it asks you for a UPC code, enter 30067-6286-143. Redeem.
4) Your card should show up in a few hours in your email.
Drink and enjoy!