* @return list of {@see FlatRateShipping}, {@see MerchantCalculatedShipping},
* {@see Pickup}
*/
private ShippingMethodsType addShippingMethod(Object shippingMethod)
throws JAXBException {
ShippingMethodsType methods
= _objectFact.createMerchantCheckoutFlowSupportShippingMethodsType();
List methodList
= methods.getFlatRateShippingOrMerchantCalculatedShippingOrPickup();
methodList.add(shippingMethod);
return methods;
}