diff --git a/app/controllers/spree/api/v2/storefront/queue_cart/line_items_controller.rb b/app/controllers/spree/api/v2/storefront/queue_cart/line_items_controller.rb
new file mode 100644
index 000000000..2509a62d2
--- /dev/null
+++ b/app/controllers/spree/api/v2/storefront/queue_cart/line_items_controller.rb
@@ -0,0 +1,56 @@
+module Spree
+  module Api
+    module V2
+      module Storefront
+        module QueueCart
+          class LineItemsController < CartController
+            before_action :ensure_order, only: :create
+            before_action :load_variant, only: :create
+            before_action :ensure_cart_exist, only: :create
+
+            # override
+            def create
+              spree_authorize! :update, spree_current_order, order_token
+              spree_authorize! :show, @variant
+
+              job = SpreeCmCommissioner::EnqueueCart::AddItemJob.perform_later(
+                spree_current_order.id,
+                @variant.id,
+                add_item_params[:quantity],
+                add_item_params[:public_metadata],
+                add_item_params[:private_metadata],
+                add_item_params[:options]
+              )
+
+              result = SpreeCmCommissioner::EnqueueCart::AddItemStatusMarker.call(
+                order_number: spree_current_order.number,
+                job_id: job.job_id,
+                status: 'processing',
+                queued_at: Time.current,
+                variant_id: @variant.id,
+                quantity: add_item_params[:quantity]
+              )
+
+              line_item_queue = SpreeCmCommissioner::QueueItem.new(
+                id: job.job_id,
+                status: result.firestore_status,
+                queued_at: result.firestore_queued_at,
+                collection_reference: result.firestore_collection_reference,
+                document_reference: result.firestore_document_reference
+              )
+
+              render_serialized_payload do
+                serialize_resource(line_item_queue)
+              end
+            end
+
+            # override
+            def resource_serializer
+              Spree::V2::Storefront::FirestoreQueueSerializer
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/app/interactors/spree_cm_commissioner/enqueue_cart/add_item.rb b/app/interactors/spree_cm_commissioner/enqueue_cart/add_item.rb
new file mode 100644
index 000000000..17e82355c
--- /dev/null
+++ b/app/interactors/spree_cm_commissioner/enqueue_cart/add_item.rb
@@ -0,0 +1,43 @@
+module SpreeCmCommissioner
+  module EnqueueCart
+    class AddItem < BaseInteractor
+      delegate :order_id, :variant_id, :job_id, :quantity, :public_metadata, :private_metadata, :options, to: :context
+
+      def call
+        result = add_item_to_cart
+        if result.success?
+          update_status('completed')
+        else
+          update_status('failed')
+        end
+      end
+
+      def add_item_to_cart
+        Spree::Cart::AddItem.call(
+          order: order,
+          variant: variant,
+          quantity: quantity,
+          public_metadata: public_metadata,
+          private_metadata: private_metadata,
+          options: options
+        )
+      end
+
+      def update_status(status)
+        SpreeCmCommissioner::EnqueueCart::AddItemStatusMarker.call(
+          order_number: order.number,
+          job_id: job_id,
+          status: status
+        )
+      end
+
+      def order
+        @order ||= Spree::Order.find(order_id)
+      end
+
+      def variant
+        @variant ||= Spree::Variant.find(variant_id)
+      end
+    end
+  end
+end
diff --git a/app/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker.rb b/app/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker.rb
new file mode 100644
index 000000000..70dc1bdb9
--- /dev/null
+++ b/app/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker.rb
@@ -0,0 +1,75 @@
+require 'google/cloud/firestore'
+
+module SpreeCmCommissioner
+  module EnqueueCart
+    class AddItemStatusMarker < BaseInteractor
+      delegate :order_number, :job_id, :status, :queued_at, :variant_id, :quantity, to: :context
+
+      def call
+        if order_number.nil? || job_id.nil? || status.nil?
+          context.fail!(message: 'Missing required fields')
+          return
+        end
+        update_cart_firestore_status
+
+        assign_firestore_context_attributes
+      end
+
+      def firestore
+        @firestore ||= Google::Cloud::Firestore.new(project_id: service_account[:project_id], credentials: service_account)
+      end
+
+      def service_account
+        @service_account ||= Rails.application.credentials.cloud_firestore_service_account
+      end
+
+      def update_cart_firestore_status
+        data_to_set = build_data_to_set
+
+        firestore.col('queues')
+                 .doc('cart')
+                 .col(order_number)
+                 .doc(job_id)
+                 .set(data_to_set, merge: true)
+      end
+
+      def build_data_to_set
+        {
+          status: status,
+          queued_at: queued_at.presence,
+          variant_id: variant_id.presence,
+          quantity: quantity.presence
+        }.compact
+      end
+
+      def firestore_object
+        firestore.col('queues').doc('cart').col(order_number).doc(job_id).get
+      end
+
+      def firestore_status
+        firestore_object[:status]
+      end
+
+      def firestore_queued_at
+        firestore_object[:queued_at]
+      end
+
+      def firestore_collection_reference
+        firestore_object.ref.path
+      end
+
+      def firestore_document_reference
+        firestore_collection_reference.split('/documents').last
+      end
+
+      def assign_firestore_context_attributes
+        document = firestore_object
+
+        context.firestore_status = document[:status]
+        context.firestore_queued_at = document[:queued_at]
+        context.firestore_collection_reference = document.ref.path
+        context.firestore_document_reference = document.ref.path.split('/documents').last
+      end
+    end
+  end
+end
diff --git a/app/jobs/spree_cm_commissioner/enqueue_cart/add_item_job.rb b/app/jobs/spree_cm_commissioner/enqueue_cart/add_item_job.rb
new file mode 100644
index 000000000..b13db8a6e
--- /dev/null
+++ b/app/jobs/spree_cm_commissioner/enqueue_cart/add_item_job.rb
@@ -0,0 +1,17 @@
+module SpreeCmCommissioner
+  module EnqueueCart
+    class AddItemJob < ApplicationJob
+      def perform(order_id, variant_id, quantity, public_metadata, private_metadata, options) # rubocop:disable Metrics/ParameterLists
+        SpreeCmCommissioner::EnqueueCart::AddItem.call(
+          order_id: order_id,
+          variant_id: variant_id,
+          quantity: quantity,
+          public_metadata: public_metadata,
+          private_metadata: private_metadata,
+          options: options,
+          job_id: job_id
+        )
+      end
+    end
+  end
+end
diff --git a/app/serializables/spree_cm_commissioner/queue_item.rb b/app/serializables/spree_cm_commissioner/queue_item.rb
new file mode 100644
index 000000000..c801f6d02
--- /dev/null
+++ b/app/serializables/spree_cm_commissioner/queue_item.rb
@@ -0,0 +1,13 @@
+module SpreeCmCommissioner
+  class QueueItem
+    attr_accessor :id, :status, :queued_at, :collection_reference, :document_reference
+
+    def initialize(id:, status:, queued_at:, collection_reference:, document_reference:)
+      @id = id
+      @status = status
+      @queued_at = queued_at
+      @collection_reference = collection_reference
+      @document_reference = document_reference
+    end
+  end
+end
diff --git a/app/serializers/spree/v2/storefront/firestore_queue_serializer.rb b/app/serializers/spree/v2/storefront/firestore_queue_serializer.rb
new file mode 100644
index 000000000..9df5b170f
--- /dev/null
+++ b/app/serializers/spree/v2/storefront/firestore_queue_serializer.rb
@@ -0,0 +1,9 @@
+module Spree
+  module V2
+    module Storefront
+      class FirestoreQueueSerializer < BaseSerializer
+        attributes :status, :queued_at, :collection_reference, :document_reference
+      end
+    end
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 1c05fb28b..d4d008b83 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -391,6 +391,10 @@
           patch :restart_checkout_flow
         end
 
+        namespace :queue_cart do
+          resources :line_items, only: [:create]
+        end
+
         resources :wished_items
         resources :user_promotion
         resources :order_promotions
diff --git a/spec/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker_spec.rb b/spec/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker_spec.rb
new file mode 100644
index 000000000..3941a4ef3
--- /dev/null
+++ b/spec/interactors/spree_cm_commissioner/enqueue_cart/add_item_status_marker_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+RSpec.describe SpreeCmCommissioner::EnqueueCart::AddItemStatusMarker do
+  let(:order_number) { 'R12345678' }
+  let(:job_id) { 'job_456' }
+  let(:status) { 'processing' }
+  let(:queued_at) { Time.now }
+
+  subject { described_class.new(order_number: order_number, job_id: job_id, status: status, queued_at: queued_at) }
+
+  describe '#call' do
+    it 'fails when order_number is missing' do
+      allow(subject).to receive(:order_number).and_return(nil)
+      expect { subject.call }.to raise_error(Interactor::Failure)
+    end
+
+    it 'fails when job_id is missing' do
+      allow(subject).to receive(:job_id).and_return(nil)
+      expect { subject.call }.to raise_error(Interactor::Failure)
+    end
+
+    it 'fails when status is missing' do
+      allow(subject).to receive(:status).and_return(nil)
+      expect { subject.call }.to raise_error(Interactor::Failure)
+    end
+  end
+end
diff --git a/spec/jobs/spree_cm_commissioner/add_item_job_spec.rb b/spec/jobs/spree_cm_commissioner/add_item_job_spec.rb
new file mode 100644
index 000000000..6b8f8fa70
--- /dev/null
+++ b/spec/jobs/spree_cm_commissioner/add_item_job_spec.rb
@@ -0,0 +1,34 @@
+require 'spec_helper'
+
+RSpec.describe SpreeCmCommissioner::EnqueueCart::AddItemJob, type: :job do
+  describe '#perform' do
+    let(:order_id) { 1 }
+    let(:variant_id) { 2 }
+    let(:quantity) { 2 }
+    let(:public_metadata) { { data: 'data' } }
+    let(:private_metadata) { { data: 'info' } }
+    let(:options) { { key: 'value' } }
+
+    it 'calls SpreeCmCommissioner::EnqueueCart::AddItem with correct arguments' do
+      add_item = class_double("SpreeCmCommissioner::EnqueueCart::AddItem")
+      allow(add_item).to receive(:call).and_return(true)
+
+      stub_const("SpreeCmCommissioner::EnqueueCart::AddItem", add_item)
+
+      job = described_class.new
+      allow(job).to receive(:job_id).and_return('test-job-id')
+
+      job.perform(order_id, variant_id, quantity, public_metadata, private_metadata, options)
+
+      expect(add_item).to have_received(:call).with(
+        order_id: order_id,
+        variant_id: variant_id,
+        quantity: quantity,
+        public_metadata: public_metadata,
+        private_metadata: private_metadata,
+        options: options,
+        job_id: 'test-job-id'
+      )
+    end
+  end
+end