3.
I have commented on the mis-understanding that you are a service provider. Service tax registration is required only for person liable for paying the service tax. It is generally the service provider and in some cases the receiver is also liable to pay either full tax or a part of it. The Subsection 2 of Rule 4 of Service Tax Rules is self explanatory which is reproduced hereunder:
"(2) Where a person, liable for paying service tax on a taxable service
(i) provides such service from more than one premises or offices; or
(ii) receives such service in more than one premises or offices; or,
(iii) is having more than one premises or offices, which are engaged in relation to such service in any other manner, making such person liable for paying service tax, and has centralised billing system or centralised accounting system in respect of such service, and such centralised billing or centralised accounting systems are located in one or more premises, he may, at his option, register such premises or offices from where centralised billing or centralised accounting systems are located."
This is only from Service tax point of view.
regards