controller creation

app/controllers/api/invoices_controller.rb

@@ -0,0 +1,33 @@
+class Api::CustomersController < ActionController::API
+  before :authenticate_token
+
+  #Description
+  # This API show current order details
+  # Input Params - order_id
+  def show
+      order = Order.find(params[:order_id])
+      order.order_items
+  end
+
+  # Description
+  # This API allow new invoice creation
+  # Input Params
+  # order_id
+  # Output Params
+  # Status [Success | Error | System Error] , order_id, error_message (*)
+  def create
+    #
+
+  end
+
+  def by_booking
+  end
+
+  def by_order
+  end
+
+  private
+  def process_items
+  end
+
+end