Can the API assign the next invoice number automatically?

When sending a simple invoice (below). It will return 'InvoiceNumber is required.'

Must I generate a unique invoice number myself or is there a way the API can do this?

Thanks...

POST /api/centerpoint/arinvoices

{
"companyId": "123",
"customerId": "456",
"date": "03-31-2025",
"invoiceNumber": "",
"amount": "3.4",
"lines": [
{
"salesItemId": "789",
"quantity": "1",

"unitPrice": "3.4",
"notes": "a note"
}
]
}