You can refer to this section to understand how to troubleshoot various issues in Coupa Connector.
The log and exception messages thrown during the configuration are captured in the log files. The log files are saved in specific location. For example, <Secure Agent installation directory>\apps\Data_Integration_Server\logs. For troubleshooting purpose, always set the Enable Logging connection property to true. But for normal task execution, set this field as false as it may affect the task performance.