1. Open Registry Editor

Click the Start Menu > Search for regedit

Click regedit.exe

2. Expand HKEY_CURRENT_USER > SOFTWARE > QBWebConnector

3. Right click Level > Modify > Update Value data to VERBOSE > OK

4. Open Web Connector | View Log(a txt document will open) > Select all (Press CTRL+A) > Press Delete or Backspace > Save(CTRL + S)

5. Open Web Connector | Check the box to the left of Payportal > click Update Selected 

6. Click View Log

7. Click Save As and save it to your desktop

Reference: https://help.developer.intuit.com/s/article/QBWC-Logging