Help Integrate PosAPI in my POS System(I prefer developer from Mongolia)

I need help with integrating PosAPI for Tax in Mongolia into my POS System, refer to the attached manual, please start your bid with PosAPI to know whether you have read this or not. I already have the POS System and PosAPI libraries I just need to know how to call it in my POS then print the lottery token. Thank you you can also check this link [login to view URL]