2026-09-07

🎉 Introducing customer numbers, project filtering, and further invoice improvements along with bug fixes.

API improvements

• customerNumber is now supported when creating and updating customers, returned when fetching customers and invoices, and available when filtering customers.
• dueDate is now optional when creating or updating an invoice. If omitted, the due date is automatically calculated from the customer's payment terms.
• projectReference, buyerReference, and contractReference are now available on invoices. These fields can be set when creating or updating an invoice and are returned when fetching invoices.
• projectReference, buyerReference, and contractReference are now available on credit notes. These fields can be set when updating a credit note and are returned when fetching credit notes.
• You can now filter invoices by projectId to return invoices with at least one line item assigned to the project.
• You can now filter supplier invoices by projectId to return supplier invoices with at least one line item assigned to the project.
• Custom unit types are now supported when creating or updating invoices.
• Supplier invoice rows have been renamed to lineItems across the supplier invoice operations.

Bug fixes

• Corrected the response body documented for the company information operation.
• Fixed an issue where updating journal entry tags through the Public API gateway returned a 404 response.