Should you be able to leave a tip on your card for your carhop at sonic?

Ca

I understand not everyone may know what sonic is, but it’s basically this drive up fast food restaurant where you park under this awning and a carhop on skates brings you your food/drink order. I LOVE sonic but very rarely carry cash with me. I really wish I had the option to leave the carhop a tip on my card, like you can if you go out to a restaurant.

What are your thoughts about this? I know this has been brought up on their Facebook page before, but I don’t think a decision was ever made either way.

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