Working with spree v2.4.1

app/controllers/spree/api/users_controller.rb

@@ -0,0 +1,28 @@
+module Spree
+  module Api
+
+    class UsersController < Spree::Api::BaseController
+      before_action :authenticate_user, :except => [:sign_up, :sign_in]
+
+      def sign_up
+        @user = Spree::User.new(params[:user])
+        if !@user.save
+          unauthorized
+          return
+        end
+        @user.generate_spree_api_key!
+      end
+
+      def sign_in
+        @user = Spree::User.find_by_email(params[:user][:email])
+        if !@user.present? || !@user.valid_password?(params[:user][:password])
+          unauthorized
+          return
+        end
+        @user.generate_spree_api_key! if @user.spree_api_key.blank?
+      end
+
+    end
+  end
+end
+

config/routes.rb

@@ -1,10 +1,10 @@
-Spree::Core::Engine.routes.prepend do
-  namespace :api do
-    scope :module => :v1 do
-      namespace :users do
-        post   :sign_up
-        post   :sign_in
-      end
+Spree::Core::Engine.add_routes do
+  namespace :api, defaults: { format: 'json' } do
+
+    namespace :users do
+      post :sign_up
+      post :sign_in
     end
+
   end
 end