Guaranteed same order between CreateInvoicesAsync request and response? #586
Description
I have a whole load of chargeable objects related to each of my customers. On a daily basis I batch-create invoices for each of my customers and I want to record the Xero InvoiceID against each of the chargeable objects placed onto each invoice, to mark them as invoiced and for traceability.
The only way that I can see of relating my objects to the Xero invoices would be if I knew for certain that the order the invoices are returned from the CreateInvoicesAsync function are the exact same order I provide them, but I can't see this fact documented anywhere so I'm reluctant to rely on that assumption.
This must be such a vanilla use case that I am sure I'm doing something stupid so any help would be greatly appreciated. I can't use e.g. Reference because I need to put PO numbers in there.