You are able to run scan for UK, US and Canadian retailers all in one account. To do this, all you need is to save both your UK and US MWS keys in the software on the API page; here: https://app.fbawizard.com/user/api.

Click on the respective section that you'd like to save keys for and follow the steps exactly as they are; for the steps relevant for your locale please see the image below:

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