If you use QuickBooks Desktop and have been connected previously, but just need to connect again, follow these steps.
Download the QWC File & Copy Password
QuickBooks Web Connector uses a “QWC” file to connect to [me]. To get the QWC file, login to [me] and navigate to Setup > Integrations. In the Accounting section, click on the "Edit Configuration" button by “QuickBooks Desktop (QWC)”.
Scroll down the page and just below "Save" you will see a few options.
First, click to “Download QuickBooks Desktop Web connector”.
Second, click the "Copy Password" button so it's ready to paste laster on into QB.
Note: it seems that using this Copy Password button is the safest way to copy/paste the password. We've found that when someone just highlights the password and uses a basic ctrl+c command to copy it, errors can result.
When you select the authorization level you may get a warning depending on what authorization level you choose. If you do get a warning click on “Yes”.
If you choose “Yes, always…..” select the [me] user you created earlier.
Then click the “Continue” button.
Finally in the Access Confirmation window click the “Done” button.
Adding the Password to the Web Connector
At this point QuickBooks Web Connector may go into hiding. Don’t worry, you most likely did the steps correctly, you just need to restore the window. You do this by opening Web Connector like you did the first time. If this is the first QWC you’ve added to QuickBooks Web Connector you’ll notice QuickBooks Web Connector looks a little different:
Now add the password. If you didn't already, you can copy this from Setup > Integrations > Edit Configuration and click on the “Copy Password” button.
When you paste it into the web connector, click out of the password box for QuickBooks Connector to save the password. Annoyingly, the password isn’t saved automatically just from typing it in but will once you click on something else in the box. A few popups may come up, just hit yes, continue, etc. to any of them.
To confirm, perform a sync/update by clicking on the checkbox in the first column, then click on the “Update Selected” button.
If the sync finished correctly you’ll see “OK” in the Status column.