docs(openspec): plan shop coupons, accounts, points, flash sales, and group buying

Capture exclusive promotion composition, empty-group cancel, and mall surface scope so the five marketing changes can be implemented without stacking or lifecycle ambiguity. Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-18 17:32:08 +08:00
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+## ADDED Requirements
+
+### Requirement: Live shop coupon surfaces
+The mall SHALL load a product's currently claimable shop coupons and the signed-in customer's coupon list through the shared API client, replacing direct coupon fixtures. Checkout SHALL present eligible owned coupons separately for each shop order and show the server-returned discount after submission. Payment and order-detail views SHALL show the persisted `discount_minor` and post-discount total from the order payload.
+
+#### Scenario: claim from a product page
+- **WHEN** a signed-in shopper claims an active coupon with remaining stock from a product page
+- **THEN** it appears in the shopper's coupon list without a fixture import
+
+#### Scenario: select coupon by shop
+- **WHEN** a cart spans two shops and the shopper selects a coupon for one shop
+- **THEN** checkout submits the choice only for that shop and the other shop remains undiscounted
+
+#### Scenario: order shows realized discount
+- **WHEN** checkout succeeds with a coupon on one shop order
+- **THEN** that order's payment and detail views show the server discount and reduced total without a client-calculated amount