@JoanneP 

Explore this payment service to deal with multi-currency transaction. It supports QBO.

https://veem.grsm.io/veems

But if you need to manage custom price lists in different currencies, for various customer types (e.g wholesale, retail, repeat customers), product categories, areas, and so on, you should consider purchasing an inventory management app and integrate it with your QBO.

Just my 2 cents.