Add necessary spree api routes related to api keys for users and bring respective implementations from spree_api

app/models/spree/user.rb

@@ -136,6 +136,16 @@ module Spree
       has_spree_role?('admin')
     end
 
+    def generate_spree_api_key!
+      self.spree_api_key = SecureRandom.hex(24)
+      save!
+    end
+
+    def clear_spree_api_key!
+      self.spree_api_key = nil
+      save!
+    end
+
     protected
 
     def password_required?

config/routes/spree.rb

@@ -118,6 +118,13 @@ Spree::Core::Engine.routes.prepend do
         end
       end
     end
+
+    resources :users do
+      member do
+        put :generate_api_key
+        put :clear_api_key
+      end
+    end
   end
 
   resources :orders do