Creates a CollectionOrder resource.

This endpoint records a payment or credit against a single collection order. It creates an invoice line that reduces the outstanding amount, synchronises linked paylink messages, and closes the collection order when fully paid. The collection order is identified by its internal {id} (path parameter) and must belong to your account — otherwise the endpoint responds with 404. Parent collection orders that have children, and orders already marked as paid, are skipped without error. ### Amounts - amount is required and must be a positive integer in the currency's minor unit (e.g. 100 = 1.00 of the main unit). - The generated invoice line uses today's date with number and description set to "payment". ### Type The optional type field controls the generated invoice line: - payment (default): records a payment. - credit: records a credit. ### Rounding If round is provided (in the currency's minor unit), the endpoint checks the outstanding amount after applying the payment. If the remainder is greater than 0 and less than or equal to round, a payment_difference invoice line is added for the remaining amount, bringing the collection order to zero. ### Response Returns the number of collection orders and paylink messages that were updated.