I have issued invoices to a Canadian client in CAD, will they be able to pay the invoices by the QB portal?

Hi there, @ken-pratt.

Currently, receiving payments outside the US is unavailable for QuickBooks Online (QBO) US version. Thus, the program doesn't support multi-currency for merchant services.

I can see how this would be helpful to you and your business to have a smooth processing of payment. Therefore, I'll take note of this as a suggestion to improve your QuickBooks experience.

As a workaround, you can consider looking for a third-party application that can process payments outside the US or let your client pay through PayPal. They can also pay you directly to your bank. This way, you can easily categorize them on the Banking page.

Additionally, there are two ways to process card payments with your payments account, for more details you can visit this article: Process a credit card payment in QuickBooks Online.

Fill me in if you have other questions. I'm just a few clicks away. Take good care!

@ken-pratt 

Utilize a 3rd party app to deal with multi currency transactionss.

https://veem.grsm.io/veems

If your client prefers to pay your invoice by a credit card, you will need another 3rd party app.