You can print return service shipping labels for the following situations where you are paying the postage for the return shipment:
Prepaid Postage: When you create a prepaid return service shipping label, your postage account is charged the shipping label price, regardless of whether that prepaid shipping label enters the mailstream. Create prepaid return service shipping labels only when you are certain that the shipping label will be used.
Endicia Pay-on-Use-Returns (EPR): When you print an EPR shipping label, your postage account is charged the shipping label price only when the EPR shipping label enters the mailstream. Create EPR shipping labels when you are not 100% certain that shipping label will be used.