What is the difference? Can there be multiple invoice IDs for a one-time order? what about a payment plan? Or is invoiceID and OrderID always 1 to 1?
Most of the time it’s the same (even the same id’s). However, it is possible to have an order (say for a subscription) that invoices many times off that one order id. In such a case, the invoice will incrementally advance it’s id by 2 each new invoice.