@Monika *********
OK so I was told by my teaching platform they could supply e-slips for proof of payment but only that. As I havent worked on that platform I dont have current or up to date payslips so would be denied. MAYBE if you are currently teaching for them and you supplied the slips you would be successful.
Not sure if you are aware but the guidelines as I understand them if you are successful are that everything related must be outside Thailand. So the company you work for, the students you teach and the way you receive payment. So if its PayPal make sure your settings are set in a country outside Thailand as I made that error at 1 stage and it took me ages to rectify to access my wages!