Orders cannot be cancelled on the Nomni Ordering (formerly OrderUp) system. You will need to refund the customer through your Payment Gateway (Stripe, Eway, Fat Zebra, PayPal, OU Stripe Payments)
For Stripe Direct (Not OU Stripe), Eway, FatZebra, and Paypal you need to proceed the refund from your own payment gateway's dashboard.
Refunds for OU Stripe Payments: How do I refund an order from Nomni Ordering Console
