You can now link an eligible BofA credit card or debit card to your Starbucks Rewards+ account to earn extra perks on purchases. Eligible spending earns 2% cash back total (an extra 1%), and you’ll also earn 1 extra Star for every $2 spent.
Click get started, sign in, then find the Bank of America offer and enroll in the offer. After that, just link your Starbucks Rewards+ account. According to the terms, each card can only be linked to one Rewards+ account, but one Rewards+ account can be linked to multiple cards.