To delete a credit card from your Starbucks Payment Methods, go to the "Personal Info" screen under "My Profile" (at www.starbucks.com not via the app although there is likely a way to do it that way too). Select "Payment Methods". You will see "Delete" under each of the cards. Strangely you can't do this from the Starbucks "my cards" screens!!
More: Starbucks - How to Make a Card the Default Card
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