In QuickBooks, locate your Settings icon in the top right corner:

In the menu selection that appears, choose Account and Settings:

And then Advanced Settings where you can add classes:

Click the Edit icon to the right of the Categories section to turn on Classes:

Go back to the Settings Icon and choose lists in the menu:

Then click on Classes from the right hand set of lists

Add your marketplaces one at a time by clicking on the green New button in the top right corner:

Once you are done creating classes for your marketplaces, refresh your QuickBooks cache in A2X, as below:

Once you have refreshed your cache, your classes will be available to map to in Invoice Settings:

They will be available in the dropdown list:

Click on "Update Invoice Settings" so when you send over settlements to QuickBooks Online, transactions will be classed by the marketplace they are from.

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