A second place to look for the payout reference, in case it isn't found in the field chosen in Payout Reference Field.
Options
DocumentNumber (ID)
ExternalInvoiceReference1
ExternalInvoiceReference2
OurReference (not commonly used)
YourOrderNumber (only for invoices, can't be used to search orders)
Leave it empty if you don't need a fallback.
Read more about how payouts work in the payout guide.
Good to know
If payouts come through a separate integration for the payment provider (for example Klarna), both integrations must agree on which field carries the order reference.