curl -X POST "https://olive-gateway-a6ba.onrender.com/api/v1/wallet/account-statement" \
  -H "Authorization: Bearer olive_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "subscriber_id": "sub_abc123",
    "pin": "1234",
    "from_date": "2025-01-01",
    "to_date": "2025-01-31",
    "format": "pdf"
  }'

{
  "success": true,
  "message": "Statement generated successfully",
  "statement_url": "https://storage.olive.example.com/statements/stmt_abc123.pdf",
  "transaction_count": 45,
  "period": {
    "from": "2025-01-01",
    "to": "2025-01-31"
  },
  "opening_balance": "50,000.00 SLE",
  "closing_balance": "125,000.00 SLE",
  "expires_at": "2025-02-01T10:30:00Z"
}