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docs/flows/cbdc-interoperability-flow.md

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+# CBDC Interoperability Flow
+
+## Overview
+
+CBDC interoperability enables cross-sovereign CBDC transfers through the CBDC Interoperability Matrix (CIM), including identity mapping, interledger conversion, and cross-certification.
+
+## Prerequisites
+
+- Source and destination CBDC systems are registered
+- CIM service operational
+- Identity mapping available
+- Interledger conversion supported
+
+## Visual Flow Diagram
+
+```
+┌─────────────┐
+│ Cross-SCB   │
+│ CBDC Transfer│
+└──────┬──────┘
+       │
+       │ 1. Identity Mapping
+       ▼
+┌─────────────────────────┐
+│ Map Cross-Sovereign    │
+│  Identity               │
+│  - CIM lookup           │
+│  - Cross-certification  │
+└──────┬──────────────────┘
+       │
+       │ 2. Interledger Conversion
+       ▼
+┌─────────────────────────┐
+│ Convert Between Ledgers │
+│  - Source CBDC format    │
+│  - Target CBDC format    │
+│  - Rate calculation      │
+└──────┬──────────────────┘
+       │
+       │ 3. Execute Transfer
+       ▼
+┌─────────────────────────┐
+│ Execute Cross-SCB      │
+│  Transfer               │
+└──────┬──────────────────┘
+       │
+       │ 4. Complete
+       ▼
+┌─────────────┐
+│ Transfer    │
+│  Complete   │
+└─────────────┘
+```
+
+## Step-by-Step Process
+
+### Step 1: Identity Mapping
+1. Lookup source identity in CIM
+2. Map to destination sovereign identity
+3. Verify cross-certification
+4. Validate KYC/AML standards
+
+**Code Reference**: `src/core/cbdc/interoperability/cim-identity.service.ts`
+
+### Step 2: Interledger Conversion
+1. Determine conversion rate
+2. Convert amount to target CBDC
+3. Verify conversion parameters
+4. Create conversion record
+
+**Code Reference**: `src/core/cbdc/interoperability/cim-interledger.service.ts`
+
+### Step 3: Execute Transfer
+1. Post to source ledger (debit)
+2. Post to destination ledger (credit)
+3. Verify both postings
+4. Create interoperability record
+
+**Code Reference**: `src/core/cbdc/interoperability/cim-interledger.service.ts`
+
+## Error Handling
+
+- Identity mapping failure: Return error
+- Conversion failure: Rollback, return error
+- Transfer failure: Rollback both ledgers
+
+## Integration Points
+
+- CIM Identity Service: `src/core/cbdc/interoperability/cim-identity.service.ts`
+- CIM Interledger Service: `src/core/cbdc/interoperability/cim-interledger.service.ts`
+
+## Performance Metrics
+
+- Total End-to-End: < 200ms target
+- Throughput: 5,000+ conversions/second
+
+---
+
+**Related Flows**:
+- [CBDC Wallet Transfer Flow](./cbdc-wallet-transfer-flow.md)
+- [Identity Verification Flow](./identity-verification-flow.md)
+