The creation of an invoice is the second step in the accounting process, which can be started right after you have created the order
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POST /businesses/{businessCode}/customers/{customerNumber}/orders/{orderReference}/invoices
application/json
{
"items": [
{
"orderItemReference": 1
}
],
"carrier": "DHL",
"dueDate": "2018-11-05",
"invoiceDate": "2018-11-04",
"dispatchDate": "2018-11-06",
"trackingCode": "123456asfd788754sdffs987",
"invoiceReference": "IDE12345678901",
"shipmentReference": "S01234567"
}
{
"internalRequestId": "23c9579b-baaf-468f-a529-f876226e183c"
}