Dear Sir,
In your case as per Notification No: 30/2012 dated 20.06.2012 the Receiver of service i.e.business entity, Registered Body corporatewould have to pay 50% of the Service Tax and the remaining 50% would be paid by the Service Provider.
About issue of Invoice:-
Service Provider shall issue an invoice complying with Rule 4A of the Service Tax Rules 1994.
The Invoice shall indicate the name & address of the person receving service, Service Tax Registration Number of the Service Provider, descripttion & value of taxable service provided and the Service Tax payable thereon.