What is the best technique for Integration of WCF service available on 001 server to VB6 application on 002 server.

Problem Statement:

The authorization access application APP01 is developed in VS2010 with WCF service is available on server 001.

The claim handling application APP02 is VB6 lagacy application available on server 002.

Now APP02 need to use the WCF service of APP01 for authorization access Control.

Please suggest the best implementation techniqe.

Thanks in advance!