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A State Machine Diagram represents the dynamic behavior of an object by showing the different states it passes through during its lifecycle in response to events. In an Enterprise e-Commerce Portal, the order transaction progresses through multiple states based on customer actions, payment gateway responses, inventory availability, and logistics updates. The following state machine demonstrates the complete lifecycle of an order while incorporating internal and external events, guard conditions, and alternate transaction paths. The assumptions are that payment is processed through an external payment gateway, inventory is maintained in real time, refund processing is automated, and cancelled orders cannot be dispatched. ``` +------------------+ | Start | +------------------+ | | Order_Placed v +------------------+ | Order_Created | +------------------+ | | Check_Inventory v +-----------------------------+ | Inventory Verification | +-----------------------------+ | | [Stock Available] [Stock Not Available] | | | | v v +---------------------+ +-------------------+ | Inventory_Reserved | _______ _________ ____ ___ ________ _____ ___ ____.
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