protected Cart validateOrRevertPromotion( HttpServletRequest request, Cart cart ) {
		log.trace( "validateOrRevertPromotion : enter" );

    	Account account = null;
		if( SecurityContextHolder.getContext().getAuthentication().isAuthenticated() ) {

			Authentication auth = SecurityContextHolder.getContext().getAuthentication();
			if( null != auth ) {
				
				try {
					account = userService.authenticated( (String) auth.getPrincipal() );
				} catch( MyAccountException e ) {
					log.error( "validateOrRevertPromotion : error", e );

					return cart;
				}

			} else {
				
				log.trace( "validateOrRevertPromotion : user is not authenticated" );
				return cart;
			}
			
		}
		
		if( account.getGuest() ) {

			if( null == cart.getPromotion() && StringUtils.isNotBlank( cart.getPromotionCode() ) ) {
				
				cart = Cart.fromCartDetails( promotionUtils.populatePromotion( cart.toCartDetails() ) );
				
				log.trace( "validateOrRevertPromotion : guest used promotion code '" + cart.getPromotionCode() + "'" );
			}
			
			log.trace( "validateOrRevertPromotion : cart is for guest" );
			return cart;
		}
	
		try {
			User user = userService.getUser( account.getGuid() );
			if( StringUtils.isNotBlank( user.getCampaign() ) && ( user.isCampaignVerified() && !user.isCampaignRevoked() ) ) {
				log.trace( "validateOrRevertPromotion : authenticated user is part of campaign" );
				
				ThirdPartyCampaign campaign = userService.getCampaign( user.getCampaign() );
				if( null != campaign ) {
					
		            cart.setPromotionCode( campaign.getPromoCode() );
		            cart = Cart.fromCartDetails( promotionUtils.populatePromotion( cart.toCartDetails() ) );

					log.trace( "validateOrRevertPromotion : campaign added to cart" );
				}
				
				log.trace( "validateOrRevertPromotion : cart is for authenticated user with campaign" );
				return cart;
			} else {
				
				if( null == cart.getPromotion() && StringUtils.isNotBlank( cart.getPromotionCode() ) ) {
					
					cart = Cart.fromCartDetails( promotionUtils.populatePromotion( cart.toCartDetails() ) );
					
					log.trace( "validateOrRevertPromotion : authenticated user used promotion code '" + cart.getPromotionCode() + "'" );
				}
				
				log.trace( "validateOrRevertPromotion : cart is for authenticated user" );
				return cart;
			}
			
		} catch( MyAccountException e ) {
			log.error( "validateOrRevertPromotion : error", e );
		}
				

		log.trace( "validateOrRevertPromotion : exit, no promotion applied" );
        return cart;
    }