Online Bill Pay - XML file creation/automatic submission to bank from Dynamics GP Accounts Payable

We have a need to create an XML file from AP to a bank (client doesn't cut checks, they send to the bank for online bill pay.      Has anyone worked with this, or is there a 3rd party that handles this?   They would be processing AP through GP, just not cutting checks.    They will then create/submit an xml file (required by the bank with specs), but must be an automatic process.    If you have had experience here, please advise.  Thank you!