This!

(upvotes are to the left FYI)

Oh my god, same! I’ve been using it for a week or so thanks to Lemmy and it stopped working yesterday.

I don’t think 10-15% has been considered a reasonable tip for “above and beyond” since the 80s. Most will take that as an insult worse than not tipping, funnily enough.

As for pre-tips, they (intentionally?) design the checkout process such that if there’s a pre-tip, there is no post-tip. It’s basically a “don’t spit in my burger” fee.