You're wrong

Salary is based on your experience and skillset. I got my first full-time job early 2020, before that I was working for myself. I had no "salary slips" to show. They didnt even ask for it, nor ask how much I was making.

HR just responded with an offer, and I countered with what I wanted. Because the company wanted me, I got what I asked for; later I found out it was actually above the allocated budget for the position.

Based on your logic, I wouldnt get what I have now. Many are poonting out the idiocy of your approach. Aside from the ethical and legal issues of your actions... its simply impractical. You are making things harder than it has to be.

Just offer what your company is willing to pay, whether that is above/below their previous payslip is irrelevant.

This HR staff so geng, spend more time on FB debating his sohainess on filtering candidates than actually doing his job

Have you talked to the team that the position is for and what their opinion is? If I have a capable candidate that's blocked from entering my team because some sohai HR staff want to prove payslips, that staff's head is going to roll.

You are being disruptive to the company at this point.

I pay them, observe them do their job, if they suck then don't continue after probation. Simple right? Important thing is to see their actual work, rather than base on "documentation" which like you say, can be faked. Do business sure got some risk of sohai employees. Just like you, your company is wasting money hiring you. You dare to show your boss or future employer this thread?

Kesian the companies that you work for, definitely not getting their money's worth

I think this response says everything about the TS. Must be such a small insecure person, that the only way to exert power in his life is through trying to play the white knight of HR

so means you also tipu la sendiri admit not doing what people are paying you for. Penipu scammer!