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#247
refactor: migrate payment service to v2 contract
High

Breaking contract change

The response shape in PaymentService.processRefund() no longer matches the contract consumed by OrderService. This will break downstream callers.

src/services/payment/refund.ts:42

Medium

Missing error propagation

The new retry logic swallows TransactionTimeout errors that the billing dashboard depends on for alerting.

src/services/payment/retry.ts:18

Info

Documentation drift

The Notion runbook for payment refunds still references the v1 endpoint. Consider updating it alongside this PR.

docs/runbooks/refunds.md

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The product

Start with PR review. Keep the system context.

Savio starts by reviewing pull requests. As it reads more evidence, it becomes useful for system questions, dependency changes, and planning.

Reviews

Context-aware PR reviews

Every review draws on the full system model — not just the diff. Findings cite specific evidence and explain why the change matters.

highMissing null check on user.subscription before billing call
mediumRetry count changed from 3→5 but timeout unchanged — may exceed SLA
infoNew helper duplicates logic in src/utils/format.ts:24
Knowledge

Living system understanding

Structured sections with confidence levels, evidence citations, and freshness tracking. Ask questions and get grounded answers.

Architecture
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Data Model
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API Contracts
78% · 19 claims
Deployment
65% · 12 claims
Signals

What needs attention

Contradictions, gaps, stale assumptions, and spec drift — surfaced automatically as the system model evolves.

Contradiction

Docs say auth uses JWT but code implements session tokens

Gap

No evidence found for error handling in payment webhook

Stale

Deployment runbook last verified 4 months ago

Planning

Dependencies and blast radius

Understand what a change might affect. See upstream dependencies, downstream consumers, and where contracts may break.

PaymentService v23 downstream consumers
OrderService — contract may break
BillingDashboard — compatible
RefundWorker — missing new field

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