Language: Python
Label: safe
CWE: CWE-203 \u2014 Observable Discrepancy
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Code:
def get_transaction(
    payment: "Payment", transaction_id: str, kind: TransactionKind,
) -> Transaction:
    transaction = payment.transactions.filter(kind=kind, token=transaction_id)
    return transaction