Apple Wallet Security Code

I’m trying to transfer my card balance from Apple wallet to the starbucks app because I’ve had issues with Apple wallet & so I can use stars easier & order ahead et cetera, but there’s no option in the wallet to transfer & the Starbucks app requires a security code which isn’t anywhere on the wallet app. I’ve contacted Apple & they said not their problem so I contacted Starbucks & they said talk to Apple. I’ve seen other people have had this issue when I do a google search, but the posts are years old & don’t have a resolution. Any ideas?