HI, One of my international client wants to work with me on the monthly basis.. He is only giving be a small amount of advance and will pay rest of the money after the end of each month. As per the payment, It will be done via paypal Is there any agreement that we both can sign before the work is started and make both of us secured.. I am basicaaly woried for the first month of this project.. If I work for a month and after that he refuses to pay.. What should we do then?? Please help..