I'd be happy to explain whether or not customers have unique ID numbers in QuickBooks Online, @thuvler.
The customer's ID is currently unavailable. As a workaround, you can manually enter them in the Notes section. This way, it's easier to keep track of their information.
To proceed, follow the steps below:
Go to the Sales tab, then choose Customers.
Select their name from the list, then select Edit.
Scroll down to the Notes and attachments section to add the ID no.
Tap Save.
However, if you're referring to QuickBooks Online company ID, you can press the following keys on your keyboard:
Thank you for your response. We are importing customer data from QB into our CRM. The CRM will import AR details back into QB. During the initial import from QB into our CRM, not all data imported. I need to manually add QB data into our CRM--which means I need to match the records. The QB ID did import into our CRM. Without the QB ID in QB, how do I make the match to manually update?