The QuickFile/GoCardless integration allows a direct debit mandate to be set up by someone in another country - in my case a customer in Australia who used the QuickFile-generated link and successfully set up the mandate within GoCardless. But the integration doesn’t support collecting payment for an invoice that is not in GBP.
It would be great it the QuickFile integratoin could support the currencies that GoCardless supports, especially when it comes to collecting payment on recurring invoices (the business model we use), as then there is a single system for invoices and auto-billing payments.