Looking for the Company ID in QuickBooks Online? Or maybe you’re wondering why you need it first? You’ll be asked for this by software developers, who’s apps you’re using, so they can confirm which QuickBooks Online Company file you’re trying to use their app with. You may also be asked for this when contacting support.

My suggestions is that you jot it down somewhere, for quick access when you need it. Also note that when you bring up the company ID in QuickBooks Online, you will also find some other useful keyboard shortcuts.