{
    "transactions": [
        {
            "id": "TXN-001",
            "type": "deposit",
            "account_id": "ACC-001",
            "amount": 500.00,
            "description": "Salary payment"
        },
        {
            "id": "TXN-002",
            "type": "withdrawal",
            "account_id": "ACC-001",
            "amount": 200.00,
            "description": "ATM withdrawal"
        },
        {
            "id": "TXN-003",
            "type": "withdrawal",
            "account_id": "ACC-002",
            "amount": 1500.00,
            "description": "Rent payment - exceeds balance"
        },
        {
            "id": "TXN-004",
            "type": "deposit",
            "account_id": "ACC-002",
            "amount": -100.00,
            "description": "Invalid negative deposit"
        },
        {
            "id": "TXN-005",
            "type": "deposit",
            "account_id": "ACC-003",
            "amount": 1000.00,
            "description": "Deposit to frozen account"
        },
        {
            "id": "TXN-006",
            "type": "transfer",
            "account_id": "ACC-001",
            "to_account_id": "ACC-002",
            "amount": 750.00,
            "description": "Transfer to Bob"
        },
        {
            "id": "TXN-007",
            "type": "withdrawal",
            "account_id": "ACC-999",
            "amount": 50.00,
            "description": "Unknown account"
        },
        {
            "id": "TXN-008",
            "type": "deposit",
            "account_id": "ACC-001",
            "amount": 0,
            "description": "Zero-amount deposit"
        }
    ]
}