You can accept and reject incoming orders by navigating to the orders tab and viewing your live orders.

Auto-accept must be toggled OFF if you'd like to accept/reject orders manually. Go to Stores > Settings > Operations > scroll down and toggle OFF Auto Accept

Don't forget to click Save!

To check on rejected orders, simply go to Orders > All Orders > Select date and store > More filters > Toggle ON Rejected

The customer will receive an email and their order status will be updated to let them know that their order cannot be fulfilled.

Payments are processed once orders are placed. Hence, if you have card payments enabled, you will still need to refund rejected orders.

Go to Orders > All Orders > Orders > All Orders > Select date and store > More filters > Toggle ON Rejected and click on the rejected order.

Click on the Refund order button to process the refund.

You can either toggle 'Full refund' to refund the whole amount or refund only a specific amount (eg service charge/delivery fee) and select a reason for the refund.