I don't know, but just the other day I asked a barista if he had a way for me to put his tip on my Starbucks card. It doesn't provide a way to do that. So now

I don't know, but just the other day I asked a barista if he had a way for me to put his tip on my Starbucks card. It doesn't provide a way to do that. So now when I use my card, I give them a cash tip. They're surprised at that. I don't generally use cards but sometimes I receive them as gifts.