Hello gestbr,
Welcome back to the Community. QuickBooks is a versatile program that helps you streamline your work using the powerful features offered in the program. Rest assured, I'll be glad to share more info so you're on the right track.
The feature you've described isn't available as the Online Payments module is designed to manage on Canadian dollars. I can see the benefit of having the multi-currency option for your business and I encourage you to send feedback about this to our engineers. You can send feedback by clicking on the Gear icon and looking for Feedback. New product ideas and improvements are based on the feedback we get from users like you.
Let me know if you have other questions by leaving a comment below. I'll be here to assist.