code: @RequestMapping(value = "predefinedPromotionLevels", method = RequestMethod.GET)
      public Resources<PredefinedPromotionLevel> getPredefinedPromotionLevelList() {
          return Resources.of(
                  predefinedPromotionLevelService.getPredefinedPromotionLevels(),
                  uri(on(getClass()).getPredefinedPromotionLevelList())
          ).with(
                  Link.CREATE,
                  uri(on(getClass()).getPredefinedPromotionLevelCreationForm())
          ).with(
                  "_reorderPromotionLevels",
                  uri(on(getClass()).reorderPromotionLevelListForBranch(null))
          );
      }
docs: Gets the list of predefined promotion levels.