Issuing an exchange
Creating an exchange for online or in-store sales can only be done in the Shopify POS app.
*If you are doing an online order exchange you will first have to turn the order filtering off to display both online and in-store.
In the Shopify POS for Android, click Orders on the bottom tab.
click on the order you would like to exchange.
Click “Return or Exchange”
Select the item you would like to exchange.
Click “Add products for exchange” towards the bottom of the page.
Search the new product and add to cart.
Finish sale as you would a normal sale.