Round percentage sale commissions to the nearest cent

[pepeladeira]

Summary by CodeRabbit

• Bug Fixes

  • Improved consistency in percentage-based earnings calculations while preserving existing rounding behavior.

• Tests

  • Added comprehensive coverage for percentage rewards, fractional cents, half-up rounding, zero values, quantities, flat rewards, and unsupported reward types.

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Project	Deployment	Actions	Updated (UTC)
dub	Ready	Preview	Aug 19, 2026 11:47pm

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No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between afa411b and a80e4d0.

📒 Files selected for processing (1)

• apps/web/tests/commissions/calculate-sale-earnings.test.ts

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📝 Walkthrough

Walkthrough

The percentage earnings calculation reorders its operands without changing rounding. Tests now cover percentage, flat, quantity, zero-value, rounding, and unsupported reward cases.

Changes

Sale earnings rounding

Layer / File(s)	Summary
Rounded earnings calculation and unit coverage apps/web/lib/api/sales/calculate-sale-earnings.ts, apps/web/tests/commissions/calculate-sale-earnings.test.ts	The percentage calculation preserves rounded results. Tests cover half-up rounding, fractional cents, quantities, flat rewards, zero values, and unsupported reward types.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to a80e4

This PR makes a localized change to round percentage sale commissions to the nearest cent, with accompanying tests. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: rounding percentage sale commissions to the nearest cent.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

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• Create PR with unit tests
• Commit unit tests in branch sale-commission-rounding

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Actionable comments posted: 1

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Inline comments:
In `@apps/web/lib/api/sales/calculate-sale-earnings.ts`:
- Line 24: Update the percentage earnings calculation in the relevant
sale-earnings function to use decimal-safe arithmetic so fractional percentages
such as 2.9% of 500¢ round to 15 rather than being affected by floating-point
precision; add a regression test covering this case.

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---

ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6a7a9a5 and 8100a09.

📒 Files selected for processing (3)

• apps/web/lib/api/sales/calculate-sale-earnings.ts
• apps/web/tests/commissions/create-commission.test.ts
• apps/web/tests/sales/calculate-sale-earnings.test.ts

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[steven-tey]

@coderabbitai final review, is this fully backwards compatibel?

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '--- PR diff ---'
git diff --find-renames origin/main...HEAD -- \
  apps/web/lib/api/sales/calculate-sale-earnings.ts \
  apps/web/tests/commissions/calculate-sale-earnings.test.ts

echo '--- Source outline ---'
ast-grep outline apps/web/lib/api/sales/calculate-sale-earnings.ts --items all --view expanded

echo '--- Source ---'
cat -n apps/web/lib/api/sales/calculate-sale-earnings.ts

echo '--- Test outline ---'
ast-grep outline apps/web/tests/commissions/calculate-sale-earnings.test.ts --items all --view expanded

echo '--- Test file ---'
cat -n apps/web/tests/commissions/calculate-sale-earnings.test.ts

echo '--- Call sites ---'
rg -n -C 4 '\bcalculateSaleEarnings\s*\(' apps/web -g '*.ts' -g '*.tsx'

echo '--- Related monetary rounding conventions ---'
rg -n -C 3 '\b(Math\.round|round|toFixed)\b' apps/web/lib/api/sales apps/web/lib -g '*.ts' | head -n 240

Length of output: 29992

---

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '--- Commission update context ---'
sed -n '120,205p' apps/web/lib/api/commissions/update-partner-commission.ts

echo '--- Partner commission workflow context ---'
sed -n '340,410p' 'apps/web/app/(ee)/api/workflows/create-partner-commission/route.ts'

echo '--- Network referral commission context ---'
sed -n '175,235p' apps/web/lib/partner-referrals/create-network-referral-commission.ts

echo '--- Customer-sales import context ---'
sed -n '135,195p' apps/web/scripts/programs/5-import-customer-sales.ts

echo '--- Reward amount conversion ---'
ast-grep outline apps/web/lib/partners/get-reward-amount.ts --items all --view expanded
cat -n apps/web/lib/partners/get-reward-amount.ts

Length of output: 9502

---

@steven-tey No. It is not fully backward compatible at the result-value level.

The API, types, and database schema are unchanged. Flat commissions are unchanged.

For percentage commissions, the result changes whenever the commission contains a fractional cent. For example, a 15¢ sale at 10% now produces 2¢ instead of the prior stored 1¢ result. This is the intended behavior.

Existing commission records remain unchanged until a recalculation occurs. However, an update to an eligible unpaid sale commission runs calculateSaleEarnings again and can change its earnings value. New commissions and imported commissions also use the new rounding.

Therefore, this is backward compatible for integration contracts, but not for historical percentage-commission calculation semantics.

---

🧠 Learnings used

Learnt from: steven-tey
Repo: dubinc/dub PR: 0
File: :0-0
Timestamp: 2026-06-03T20:04:17.294Z
Learning: In dubinc/dub PR `#3824`, replacing `context.sale.productId` with `context.sale.products` (array) in `checkout-session-completed.ts` and `invoice-paid.ts` is NOT a breaking change for existing reward conditions. The updated `create-partner-commission/route.ts` workflow mediates this: when `context.sale.products` is present and a `sale.productId` modifier is detected, the workflow iterates through each product, reconstructs `productId` from each product entry, and calls `determinePartnerReward` with a per-product context. So `evaluate-reward-conditions.ts` still receives `productId` correctly — it just comes from the `products` array iteration rather than a top-level `context.sale.productId`. Do not flag this as a breaking change in future reviews.

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