# CBDC Wallet Transfer Flow

## Overview

CBDC wallet transfers enable movement of CBDC between wallets with compliance checks and balance verification. This flow documents the complete transfer process.

## Prerequisites

- Source and destination wallets exist and are active
- Sufficient balance in source wallet
- Compliance checks pass
- CBDC transaction service operational

## Visual Flow Diagram

```
┌─────────────┐
│ Transfer    │
│  Request    │
└──────┬──────┘
       │
       │ 1. Validate Wallets
       ▼
┌─────────────────────────┐
│ Validate Wallets       │
│  - Source wallet        │
│  - Destination wallet   │
│  - Balance check        │
└──────┬──────────────────┘
       │
       │ 2. Compliance Check
       ▼
┌─────────────────────────┐
│ Compliance Check        │
│  - AML screening        │
│  - KYC verification      │
└──────┬──────────────────┘
       │
       │ 3. Execute Transfer
       ▼
┌─────────────────────────┐
│ Execute Transfer        │
│  - Update balances      │
│  - Create transaction   │
└──────┬──────────────────┘
       │
       │ 4. Complete
       ▼
┌─────────────┐
│ Transfer    │
│  Complete   │
└─────────────┘
```

## Step-by-Step Process

### Step 1: Validate Wallets
1. Lookup source wallet
2. Lookup destination wallet
3. Verify both wallets are active
4. Check source wallet balance
5. Verify sufficient funds

**Code Reference**: `src/core/cbdc/cbdc-wallet.service.ts`

### Step 2: Compliance Check
1. Run AML screening
2. Verify KYC status
3. Check transaction limits
4. If compliance fails, reject transfer

**Code Reference**: `src/core/compliance/aml.service.ts`

### Step 3: Execute Transfer
1. Create transaction record
2. Update source wallet balance (debit)
3. Update destination wallet balance (credit)
4. Post to ledger
5. Return transaction ID

**Code Reference**: `src/core/cbdc/cbdc-transaction.service.ts`

## Error Handling

- Wallet not found: Return error
- Insufficient balance: Return error
- Compliance failure: Reject transfer
- Ledger posting failure: Rollback balances

## Integration Points

- CBDC Wallet Service: `src/core/cbdc/cbdc-wallet.service.ts`
- CBDC Transaction Service: `src/core/cbdc/cbdc-transaction.service.ts`
- AML Service: `src/core/compliance/aml.service.ts`

## Performance Metrics

- Total End-to-End: < 150ms target
- Throughput: 10,000+ transfers/second

---

**Related Flows**:
- [CBDC Mint Burn Flow](./cbdc-mint-burn-flow.md)
- [AML Screening Flow](./aml-screening-flow.md)