When a customer returns merchandise that was originally purchased from your Shopify web shop, there are two steps to complete the return.
The first step is returning the payment to the customer, this will be processed through Shopify. On the sales order in Shopify, you should see a button that says "refund." You will see this right next to where it says "Payment has been accepted."
The second step to the return is to get the inventory back into Springboard. To do this, you will want to process a return in the Point of Sale. You will ring this through as a typical return, however you may want to create a custom payment type called "Shopify" and choose this as the tender method.
You have successfully returned an item purchased on Shopify.