All you need for a residency certificate is a copy if the lease where you stay. I have bought 2 motorbikes and gotten many driver's licenses only being stamped in as a tourist.
Yes. They originally asked me for a letter from the employer saying I could work remotely. Then they asked for a contract and a July Payslip. Then right before the approval they asked me for a current payslip.
I booked a flight with them at the start of covid. Covid broke out and everything canceled, but they did not want to refund my money. They ended up giving me 1/3 of it back.
I keep a picture in my phone of the best haircut I ever had. Whatever barber I go to in the world, all I have to do is show the picture without having to try to explain how I want it.