# Phase 4.3 Verification Gate — Three-Way Matching Engine

**Phase:** 4.3 Three-Way Matching Engine  
**Verification Date:** September 4, 2026  
**Status:** PASSED & APPROVED  

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## Verification Criteria & Checklist

| Criteria | Result | Evidence / Implementation Details |
|---|---|---|
| **1. ThreeWayMatchingEngine Implemented** | PASS | `app/Domains/Core/Services/ThreeWayMatchingEngine.php` created and operational. |
| **2. PO/Receipt/Invoice Comparison** | PASS | Evaluates PO unit prices, ordered quantities, receipt quantities, and invoice quantities. |
| **3. Quantity Variance Rules** | PASS | Detects overages and underages using 4-decimal precision (`bccomp`). |
| **4. Unit Price Variance Rules** | PASS | Flags unit price discrepancies between PO and Supplier Invoice. |
| **5. Line Mismatch Rules** | PASS | Detects extra or unlisted items on Supplier Invoice. |
| **6. MATCHED State Handling** | PASS | Sets `SupplierInvoice.match_status` to `MATCHED` on zero discrepancies. |
| **7. DISCREPANCY State Handling** | PASS | Sets `SupplierInvoice.match_status` to `DISCREPANCY` and persists reason & JSON details. |
| **8. Discrepancy Override Engine** | PASS | `overrideDiscrepancy()` allows manager override with mandatory reason while preserving audit log. |
| **9. Tenant Security & Isolation** | PASS | Enforces `organization_id` & `business_unit_id` equality; throws `CrossOrganizationException` on mismatch. |
| **10. Business-Unit Security** | PASS | Scoped via `BusinessUnitScope` and server-side domain checks. |
| **11. Transactional Integrity** | PASS | Wrapped in `DB::transaction()` with pessimistic locking (`lockForUpdate()`). |
| **12. Zero GL Posting Introduced** | PASS | Accounting boundary preserved; GL postings strictly deferred to Phase 4.7. |
| **13. Code Formatting (Laravel Pint)** | PASS | `vendor/bin/pint --format agent` passed clean (`{"tool":"pint","result":"passed"}`). |
| **14. Full Suite Test Regression** | PASS | 205 / 205 tests passed, 368 assertions, 0 failures, 0 errors, 0 skipped. |

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## Verification Conclusion

Phase 4.3 is **PASSED & VERIFIED**.

```text
PHASE 4.3 COMPLETE — HARD STOP.
PHASE 4.4 NOT STARTED.
AWAITING HUMAN AUTHORIZATION.
```