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SOFTWARE DESIGN

Online Auction System — Payment Processing

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UPDATED 2026-06-26
TYPEUsecase
USE-CASEOnline Auction System
EXAMPLEOnline Auction System — Payment Processing
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CASE ANALYSIS

Scenario

Illustrates how a bidder pays for a won auction item, including normal payment, retry on decline, refund processing by seller, and dispute handling.

Key decisions

  • Use «include» from View Won Auctions to Make Payment to enforce payment as an integral step after winning.
  • Model retry on payment decline as an «extend» use case to keep the base payment flow clean.
  • Separate refund and dispute as seller-initiated use cases, with the payment gateway externalized as a system actor.

When to reuse this

When modeling online marketplace or auction platforms that involve bidding, winning, and payment settlement with external payment services.

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