I got dnb diploma. I want to pay fees and put for upgradation

I got dnb diploma. I want to pay fees and put for upgradation. So do I have to visit the hospital , or just pay fees and opt for upgradation online only .

I got it in West Bengal , and those hospital authorities don’t know anything about this , I am from Maharashtra. Please help.

Is it possible to just pay fees and upgrade not visiting the college.

Thank you.