[Billing Upgrade] Integration with Vertex O for PeopleSoft FSCM 9.1

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QUESTION:
We are upgrading FSCM 8.9 to FSCM 9.1. We are currently using Vertex O series 4.0.  Below is an excerpt of from the 9.1 upgrade document
" Task 6-14: Configuring PeopleSoft Integration with Vertex O PeopleSoft FSCM 9.1 communicates with the Vertex O Series web service only through PeopleSoft Integration Broker. To integrate with the Vertex O Series tax solution, you must have installed Vertex O Series 5.0 or above and the Vertex PGC (PeopleSoft Generic Connector) both provided through Vertex. A new generic tax message must be activated. Older Vertex specific messages will no longer work."