I know a site/service RAS, rent a signal. You could open an account there then link your clients account to your trading activities. It is simple and there less complications.
An other point is a tool call FXBabel, you can link your client in as you create a community group, then you can manage there account directly from yours.
fxbabel is very good because one can trade in MT4 and communicate/send the same trade to Oanda.