WCF define which webservice can be accessed by callers

Question

Hello,

 

I have created an application, with a layer that has multiple wcf(web services). Let's say WebService1, Webservice2, Webservice3, Webservice4, and Webservice5.

 

Webservice1, 2 and 3 can be called with same certificate. The issue is the caller to Webservice1, can also access Webservice2 and 3.

 

What I want is the caller to Webservice1, should only use Webservice1 and be denied access to Webservice2 and 3, keeping same certificate.

 

What options to achieve this?

 

Thanks in Advance

Al