/** @since Available in iOS 7.0 and later. */
 public boolean isExpired() {
   if (data.containsKey(IsExpiredKey())) {
     NSNumber val = (NSNumber) data.get(IsExpiredKey());
     return val.booleanValue();
   }
   return false;
 }
 /** @since Available in iOS 7.0 and later. */
 public boolean isVolumePurchase() {
   if (data.containsKey(IsVolumePurchaseKey())) {
     NSNumber val = (NSNumber) data.get(IsVolumePurchaseKey());
     return val.booleanValue();
   }
   return false;
 }