that sounds dangerous: "when workers click 'request money' it sends money"
- surely they will click all day and not work?
in principle yes you can do that but you wont be able to make it 100% automatic - it will need 'activate' clicks when on Paypal site (maybe PP one click button might do it for you)
there is an official paypal forum if you sign up as a paypal developer (free) and you will get better answers there once you say exactly what you need
you also need to work out your flow of information in detail