Dear Nantu ji.
Subscription method is same for e-Journals or e-books. You have to directly contact the owner or agencies, who are supplying the same by mail or what ever you want. If you want to send the subscription amount by DD you can send it, in the name of "what ever they want....." you want to subscribe this by online method, then you have to take print screen of each step for further correspondences. after the paid subscription amount, they will provide you login and password or may ask the IP address range, in which you want to access the same. for further correspondences they will provide you subscription no also.
Thanx a lot for your Kind information. Can you tell me the names of owner or agencies who supply e-books or e-journals within Kolkata ? Thank you again.