TRANSPORT_PROTOCOL=OXTA
TRANSPORT_PROTOCOL_VERSION=1.0
REQUEST_TYPE=SEND
MESSAGE_ID=0ahd6a007nvji90r00004igq
MESSAGE_TYPE=XML
MESSAGE_STANDARD=OAG
TRANSACTION_TYPE=INVOICE
TRANSACTION_SUBTYPE=PROCESS
DOCUMENT_NUMBER=Invoice_1234567
PARTYID=PARTYID
PARTY_SITE_ID=PARTY_SITE_ID
PROTOCOL_TYPE=HTTPS-OXTA
PROTOCOL_ADDRESS=
USERNAME=
PASSWORD=
PAYLOAD=<?xml+version="1.0"?><ProcessInvoice>...</ProcessInvoice> <!--see XML payload below-->