Model

classDiagram
  class Store{
    +string Id
    +string Name
    +string Zipcode
    +Map Meta
  }

  class Customer{
    +string Id
    +string Name
    +string Zipcode
  }

  class Item{
    +string Sku
    +string Name
    +TimeStamp EffectiveDate
    +float Price
    +bool Deleted
  }

  class LineItem{
    +int Ordinal
    +int Quantity
    +float item_total
    +float item_tax
    +float item_discounts
    +float line_total
    +Item item
    +Map~string,string~ discount_details
    +addItem(int qty, Item item)
    +removeItem(int qty, Item item)
  }
  LineItem --o Item

  class Transaction {
    +string Id
    +TimeStamp StartTime
    +TimeStamp EndTime
    +Store Store
    +Customer Customer
    +Set~LineItem~ LineItems
    +addLineItem(int qty, LineItem lineItem)
    +removeLineItem(int qty, LineItem lineItem)
  }
  Transaction --|> Store
  Transaction --|> Customer
  Transaction --> "1..*" LineItem