Set ARGOWEBSERVICE009 (WS_LOG_BILLING) to true if you want logs for the Billing Web Service to appear in the Web Service Logs view (on page 1). When you set ARGOWEBSERVICE009 to true and post any Web Service request under the BILLING sub-node through Argoservice Tester view (on page 1) from N4 or N4 Billing, the message log appears in Web Service Logs view in the application from where the API is posted.
The default value for ARGOWEBSERVICE009 (WS_LOG_BILLING) is false.