If I void an invoice in my accounting package (Xero or Quickbooks Online), will it stop the Auto-Payment in Wise-Pay?
No, voiding the invoice will not cancel any scheduled auto-payments.
For realtime payments (Credit Cards) the system will likely fail the validation for the payment due at the time of processing, but for bank debits it will not.
Solution:If you void an invoice in Xero or QuickBooks Online, you must ensure that you do the same for the scheduled payments.
If you think it is important for bank debits to be checked for payment please vote for it here.