I'd be delighted to provide some insight into your question about the accounts.
You've got it right, this is something that'll occur in the Financial Exchange. However, just to clarify, the accounts themselves won't sync or add to your QuickBooks Point of Sale (QB POS).
Instead, they'll affect the appropriate accounts in QB POS accordingly based on your account mappings for the exchange. For more detailed information about this, I recommend following this article: Financial Exchange Overview
Please let me know if you have any other questions. I'm determined to clarify this for you. Thanks for dropping by, I'm looking forward to hearing from you again.