I'm not cranky. I tell them nicely! In fact, only last night I let a lad off a euro 'cos he only had €23.05 on his Revolut card... and paid Sumup 1.65% of what I got.
Why are you paying Sum-up 1.65% ?
That is the standard rate fer non business customers.
I use their Taxi business account and get a better rate of 1.42%.
I just double checked to confirm, and my last sum-up sales were €22 and €21.69 was transfered to my bank account, which is 1.42% commission.