Orders — attaching invoices simplified to one request
A new endpoint, POST /order/{orderId}/billing-documents/files, lets sellers attach an invoice to an order in a single request (multipart: PDF file + invoice number), replacing the two-step POST .../invoices + PUT .../invoices/{invoiceId}/file flow, which is now marked deprecated. No removal date has been given yet for the old endpoints.
why it mattersSellers with their own ERP integrations for issuing invoices should move to the new endpoint before the old one is retired.