Quick answer: A paid order can't be changed. Cancel and refund it, then ask the customer to place a new order.
Once a customer submits and pays for their order, the order cannot be changed through the system.
Customer and restaurant will need to contact each other if they wish to update or cancel and seek a refund.
If a customer placed the wrong order and wants to change it, cancel the order and refund them, then ask them to place a new order. See How do I cancel an order? and How do I refund an order from the Nomni Ordering console?
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