情境
An online auction platform where bidders place manual or automatic bids, sellers list items, and a payment gateway processes winning bids. The diagram shows key use cases and their relationships.
這張圖裡有什麼
看懂背後的決策。
01
Modeled automatic bid as an include of Place Bid
02
Outbid notification extends Place Bid via extension point
03
Payment Gateway as external actor
Reusable for any auction or marketplace system with proxy bidding and payment integration.