code: @Override
  	public CommerceDiscount fetchCommerceDiscountByUuidAndGroupId(String uuid,
  		long groupId) {
  		return commerceDiscountPersistence.fetchByUUID_G(uuid, groupId);
  	}
docs: Returns the commerce discount matching the UUID and group.
  
  @param uuid the commerce discount's UUID
  @param groupId the primary key of the group
  @return the matching commerce discount, or <code>null</code> if a matching commerce discount could not be found