Per the guidance on the "For Suppliers" webpage, suppliers use the uwashington@ghxinvoicing.com email unless the supplier is integrated with GHX (suppliers should know whether they are integrated with GHX and this email does not apply).
Suppliers do not need to email invoices to departments first, for converted BPOs and doing so may cause delays in processing. Suppliers should be encouraged to follow the guidance on the "For Suppliers" webpage.