You need to enable ccg logs and check in the log file.
You can use below logger to enable debug for WS source.
logger.sailpoint.name = sailpoint.connector.webservices
logger.sailpoint.level = debug
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
logger.sailpoint.name = sailpoint.connector.webservices.v2
logger.sailpoint.level = debug
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
logger.sailpoint.name = connector.common.oauth2
logger.sailpoint.level = debug
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
logger.sailpoint.name = connector.common.http
logger.sailpoint.level = debug
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
logger.sailpoint.name = connector.sdk.webservices
logger.sailpoint.level = debug
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
logger.sailpoint.name = connector.sdk.webservices.ExecutionMediator
logger.sailpoint.level = trace
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
Specifically for your use case this one would be used:
logger.sailpoint.name = connector.sdk.webservices.ExecutionMediator
logger.sailpoint.level = trace
logger.sailpoint.additivity = false
logger.sailpoint.appenderRef.rolling.ref = STDOUT
You can also set isDevelopmentMode in connector json and it would print request dump.