Artifact: Full Delivery Plan — Aurora Checkout Redesign

Aurora Checkout Redesign -- full delivery plan -- exercises co-01, co-03, co-04, co-05, co-07, co-09, co-10.

Work breakdown structure

Checkout Redesign
1.0 Payment Integration
  1.1 Stripe provider adapter
  1.2 PayPal provider adapter
  1.3 Apple Pay provider adapter
2.0 Cart and Order Flow
  2.1 Cart persistence rework
  2.2 Order summary UI
  2.3 Order confirmation email
3.0 Quality and Launch
  3.1 Checkout end-to-end test suite
  3.2 Load test at 3x peak traffic
  3.3 Feature-flag rollout plan

Critical path

2.1 -> 2.2 -> 3.1 -> 3.2 -> 3.3, 17 working days, zero slack. This chain, not any single payment-adapter branch, drives the November 15 launch date.

Velocity estimate

41 points total, 15-point average velocity (three sprints: 14, 17, 15) -> forecast 3 sprints.

Sprint plan

Sprint	Committed items	Points
Sprint 1	2.1 Cart persistence rework (8), 1.2 PayPal adapter (5)	13
Sprint 2	1.1 Stripe adapter (5), 1.3 Apple Pay adapter (3), 2.2 Order summary UI (3), 2.3 Order confirmation email (2)	13
Sprint 3	3.1 E2E test suite (8), 3.2 Load test (5), 3.3 Feature-flag rollout (2)	15

Matches the 3-sprint forecast exactly; every task's dependencies are satisfied by an earlier sprint.

Risk register (current snapshot)

#	Risk	Score	Mitigation	Owner
1	Apple Pay API introduces a breaking change before launch	12	Pin the SDK version, subscribe to Apple's developer changelog, smoke-test weekly against the sandbox.	Dinar (payments lead)
2	Load test reveals checkout cannot sustain 3x peak traffic	15	Run the load test three weeks before launch, reserve autoscaling headroom, keep a feature-flag kill switch.	Priya (SRE)
3	Bayu (only engineer who knows legacy cart-persistence code) on scheduled leave in Sprint 2	15	Pair a full walkthrough session before leave starts, document quirks in a runbook.	Bayu (tech lead)
4	Holiday code-freeze policy shortens the usable schedule by one week	12	Confirm the exact freeze date now; build the week into the schedule buffer.	Dinar
5	Finance requests a sixth payment provider mid-project	9	Route through the change-management decision process.	PM (Aurora)

Metrics plan

Metric	Decision it informs
Burndown (per sprint)	Flatline for 2+ days mid-sprint -> investigate a blocker the same day.
Cycle time (E2E-suite stage)	Trending up for 2 consecutive weeks -> add QA capacity or lower that stage's WIP limit.

The critical path (17 days) drives the schedule commitment, not any individual payment-adapter branch. The 3-sprint velocity estimate aligns exactly with the 3-sprint plan. Every metric names a concrete decision. The risk register's top-ranked risks (by score) have mitigations already in flight.