Using devise with wicked for sign up wizards

registrations_controller.rb

class RegistrationsController < Devise::RegistrationsController
  
  def create
    build_resource
        
    if resource.save
      if resource.active_for_authentication?
        set_flash_message :notice, :signed_up if is_navigational_format?
        sign_in(resource_name, resource)
        respond_with resource, :location => after_sign_up_path_for(resource)
      else
        set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_navigational_format?
        expire_session_data_after_sign_in!
        respond_with resource, :location => after_inactive_sign_up_path_for(resource)
      end
    else
      clean_up_passwords resource
      respond_with resource
    end
  end

  private
  
  def after_inactive_sign_up_path_for(resource)
    user_steps_path
  end
  
end

user_steps_controller.rb

class UserStepsController < ApplicationController
  include Wicked::Wizard
  steps :carrier_profile, :shipper_profile, :credit_card
  
  def show
    @user = User.last
    render_wizard
  end
  
  private 
  
  def redirect_to_finish_wizard
    redirect_to confirm_user_path
  end
end

Any idea how to add validation per step without effecting the initial devise Sign-Up view?