Hi Suresh,
Thanks for landing here.
Actually while paying your registration fee of your vacancy PSC do not want the hardcopy of your master ID, so you can pay your fee by just telling them your master ID and Vacancy NO. of your required post. But it would be better if you have the printed copy.
In other hand you can print or save you ID as PDF on Google Chrome from your mobile but not from OPERA MINI and so on. From opera you can take screenshots of your Master ID screen.
Hope it helps you.