Login on desktop mode, click the menu icon, click account, click personal info, scroll down and enter partner number.

you should also go $1 then go to partner card, add this “card” (starbucks card number + security code) to your app as a gift card

now u can scan your app in store and your discount/numbers attached no more repeating your numbers at the window/reg

I set that up when I started and just used it the other day by scanning the correct card on the app, the partner card, but the 30% discount didn’t automatically apply and I paid full price like a chump lolol.