How to Fix Qbwin.Log: Lvl_error – Verify Online Account Information or Invalid Customer Id Number?

Qbwin.Log: Lvl_error Error: Verify Online Account Information: Invalid Customer Id Number generally appears when you use or try to use an invalid Customer Id while setting up the account with online services such as Bank Feeds.  The error is mostly triggered by the log files of QuickBooks. There are a few do-it-yourself methods to troubleshooting methods to fix it.