We’ve added /sales_invoices/:id/mark_as_dubious to sales invoices. Read more in the sales invoices API documentation. We’ve added /external_sales_invoices/:id/mark_as_dubious to external sales invoices. Read more in the external sales invoices API documentation. We’ve added /external_sales_invoices/:id/mark_as_uncollectible to external sales invoices. Read more in the external sales invoices API documentation.