```ruby
require 'active_model/serializer'

module Spree
  module Hub
    class ShipmentSerializer < ActiveModel::Serializer
      attributes :id, :order_id, :email, :cost, :status, :stock_location,
                :shipping_method, :tracking, :updated_at, :shipped_at

      has_one :address, serializer: AddressSerializer, root: "shipping_address"
      has_many :line_items, serializer: LineItemSerializer, root: "items"

      class << self
        def push_it(shipment)
          payload = ActiveModel::ArraySerializer.new([shipment], each_serializer: ShipmentSerializer, root: 'shipments').to_json
          Client.push(payload)
        end
      end

      def id
        object.number
      end

      def order_id
        object.order.number
      end

      def email
        object.order.email
      end

      def cost
        object.cost.to_f
      end

      def status
        object.state
      end

      def stock_location
        object.stock_location.name
      end

      def shipping_method
        object.shipping_method.name
      end

      def updated_at
        object.updated_at.iso8601
      end

      def shipped_at
        object.shipped_at.try(:iso8601)
      end

    end
  end
end
```

Set shipping address from order in ShipmentSerializer
user
```ruby
require 'active_model/serializer'

module Spree
  module Hub
    class ShipmentSerializer < ActiveModel::Serializer
      attributes :id, :order_id, :email, :cost, :status, :stock_location,
                :shipping_method, :tracking, :updated_at, :shipped_at,
                :shipping_address

      has_many :line_items, serializer: LineItemSerializer, root: "items"

      class << self
        def push_it(shipment)
          payload = ActiveModel::ArraySerializer.new([shipment], each_serializer: ShipmentSerializer, root: 'shipments').to_json
          Client.push(payload)
        end
      end

      def id
        object.number
      end

      def order_id
        object.order.number
      end

      def email
        object.order.email
      end

      def cost
        object.cost.to_f
      end

      def status
        object.state
      end

      def stock_location
        object.stock_location.name
      end

      def shipping_method
        object.shipping_method.name
      end

      def updated_at
        object.updated_at.iso8601
      end

      def shipped_at
        object.shipped_at.try(:iso8601)
      end

      def shipping_address
        object.order.shipping_address
      end
    end
  end
end
```
assistant