Hi RV Geeks, We're in a similar boat as you. It's not possible to auto-bill in USD in the Canadian version of Quickbooks. Only CAD. You can get very close to what you want to do using the Freedom Merchants add-on, but it doesn't handle variable rate invoices or price changes without a bit of manual fiddling within the payment gateway and manual reconciliation thereafter. Unlike some other accounting apps, a large part of Quickbooks business model is in the fees made on their own payment processor. Unfortunately as a result I think we'll be waiting a very long time before we see Stripe integration or similar that would handle this natively which is a shame as I'd personally pay more for the software if it allowed more freedom in payment processor selection. I've also heard nothing to suggest Quickbooks Payments itself has USD support anywhere on its roadmap unfortunately.

As to your last question, Quickbooks method of auto-billing is a little weird and is created by recurring sales receipts. The customer doesn't setup the profile directly from the invoice. Instead, you send them an approval form to bill their card automatically, then you manually set up their card to be charged each month. Although the rest of the software is fantastic, you'll really need to use a separate invoicing solution for Quickbooks to support your needs.