We would like to know the location of the federation certificate store.

Document ID : KB000118727
Last Modified Date : 31/10/2018
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I'm running a Policy Server and I'd like to know where the Federation
Certificate Store is located. 
At first glance, from Policy Server 12.x, the certificates are located
within the Policy Store in a specific section called CDS (Certificate
Data Store). You can access them with the AdminUI and also get some
details running XPSExplorer command.

  Synchronize Key Database Instances for r6.x 

  "Previous versions of the Policy Server used a local smkeydatabase to 
   store certificate data. Each Policy Server required its own 
   smkeydatabase. For versions 12.5x and later, a centralized 
   certificate data store (CDS) replaced the smkeydatabase."