Creates a bill for the purchase order in the connected accounting integration, the same action as pressing Bill on the purchase order in Katana. Only QuickBooks Online is supported for now, and the integration must be connected with purchasing and inventory assets sync enabled.

The bill is created asynchronously. A 202 means the request was queued, not that the bill exists yet. Follow the result through the billing_status of the purchase order (NOT_BILLED becomes BILLED) or through GET /purchase_order_accounting_metadata?purchase_order_id=, where the QuickBooks bill_id appears once the bill is created.

If the purchase order cannot be billed (it is a draft, it is already billed, it has no rows, or the integration is not connected) the request is still accepted with 202 and no bill is created; the billing status stays unchanged.