[eshaffer321]

Problem

An Amazon refund of +$31.24 was never categorized. Its order was paid $31.24 by card plus $11.15 in Amazon Visa points, and the Return Center reports the refund total ($42.39). Refund matching looked for a $42.39 credit, which never appears in Monarch.

Fix

• Bump amazon-go to v0.5.0 (release). It flags refund rows on the payment transactions page (Transaction.IsRefund) and dates each row correctly.
• convertGoTransaction maps IsRefund to refund, so a refunded order no longer looks like it has duplicate card charges.
• FetchReturns fetches each refunded order's transactions (one request per order) and attaches RefundTenders to the return. It only does this when the rows match that return unambiguously (same issued day, sum equals the Return Center total).
• Refund matching, item pricing, and same-day grouping use BankRefundAmount(), the card portion. Points-only refunds are skipped with an explicit reason. Returns without a breakdown behave as before.

Testing

• Seven new tests across the provider, handler, and orchestrator; all failed with the fix disabled.
• go test ./... -race passes.
• ./itemize amazon -account wife -dry-run -days 14 now categorizes the refund against the +$31.24 credit.

Logged in docs/bug-fixes.md.

[codecov]

Codecov Report

❌ Patch coverage is 91.56627% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.75%. Comparing base (9b61da0) to head (a6f0cac).

Files with missing lines	Patch %	Lines
internal/adapters/providers/amazon/returns.go	91.17%	4 Missing and 2 partials ⚠️
...ternal/application/sync/handlers/amazon_refunds.go	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   65.48%   65.75%   +0.26%     
==========================================
  Files          51       51              
  Lines        7038     7110      +72     
==========================================
+ Hits         4609     4675      +66     
- Misses       2087     2091       +4     
- Partials      342      344       +2     

Flag	Coverage Δ
unittests	65.75% <91.56%> (+0.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/adapters/providers/amazon/provider.go	83.70% <100.00%> (ø)
internal/application/sync/amazon_returns.go	79.56% <100.00%> (ø)
...ternal/application/sync/handlers/amazon_refunds.go	88.23% <92.30%> (+0.50%)	⬆️
internal/adapters/providers/amazon/returns.go	82.60% <91.17%> (+2.26%)	⬆️

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