How to Process a Refund for Shopify

From your Shopify admin, go to Orders.
Select the order that you want to refund or partially refund.
In the payments section of the order, click Refund.
Enter the amount to be refunded along with the quantity of the items in the order (if relevant)
Optional: Enter the shipping amount that you want to refund into the Shipping field.
Optional: Enter a reason for the refund.
If you don't want to send an email to your customer when you issue the refund, then uncheck Send a notification to the customer. This option is checked by default.
Click Refund to refund the customer's order.

This is a step-by-step for processing a refund on Shopify, the process is the same for both full and partial refunds.