Hello Greg,
Please check the following documentation for details on how to configure web service integration and generate a WSDL:
1. Go to connect.ariba.com and access P2P documentation.
2. Go to the Administration tab and expand the Data Import and Administration Basics section to download the "Administration and Data Maintenance Fundamentals Guide".
3. Go to Chapter 4 (Page 49) to read up on the web service integration.
If you have any further question or if you run into any difficulties, please file a service request with Ariba Customer Support.
Regards,
Deepak Sanghi
Sr Solution Manager, Ariba P2P.