title: How do I specify Discount codes when using the RailShopRQ to query Amtrak availability?
body: <p>I'm struggling to find how to add Discount Codes to a RailShopRQ targeting Amtrak.</p>
  
  <p>I've seen Amtraks own site applying the discounts but when searching fo rthe same availability using Sabre's RailShopRQ I've been unable to secure the lower fares.</p>
  
  <p>I've tried adding DiscountTypes to the Discounts attribute on the PassengerType in RailShopRQOffersSearchCriteria. I've also tried adding it to the Discounts attribute directly on the RailShopRQOffersSearchCriteria but neither of them bring back any reduced fares. </p>
  
  <p>Is this the correct way to request discounted fares or do I need to make a separate call with a different ResponseType? Once I have the discounted fares do I then need to provide the discount codes during the RailManageBookingRQ and RailManageTicketRQ to ensure the correct Fare is sold?</p>