Hi there taxshopinc1,
It's important that all your transactions are correctly entered for your books to be well balanced. QuickBooks Payments is a great tool able to help you receive payments for your services directly in the invoice you've sent to your customers. I can provide some information about QuickBooks Payments.
QuickBooks Payments can only process payments for transactions done in CAD and is only able to be used with Canadian debit and credit cards. In order to process payments from another currency, you could possibly connect a third-party app or process the payment outside of QuickBooks. To see if there is an app that can be connected to QuickBooks to suit the needs of your business, you can go to the Apps section of your QuickBooks Online account.
If you have any other questions, feel free to reach out here.