braintree_redirect_data.rb

  def redirect_data
    customer_options = {}
    [
      :first_name,
      :last_name,
      :email
    ].each do |prepopulate_attr|
      if self.send(prepopulate_attr).present?
        customer_options[prepopulate_attr] = self.send(prepopulate_attr)
      end
    end

    redirect_options = { :redirect_url => redirect_url }
    redirect_options.merge!({:customer => customer_options}) unless customer_options.empty?
    @redirect_data ||= Braintree::TransparentRedirect.create_customer_data(redirect_options)
  end