Using this option, you can give commission to your affiliates for any order from your Shopify store. For example, if a customer forgets to use a discount code at checkout but you still want to give commission to the affiliate for the order because they referred you the customer.
To record orders like this, you need an order ID. Please note that order ID is not the order number. Order ID is visible in the URL of the page when you visit the orders page in your Shopify store. Please see screenshot below: