实现支付Token生成与验证一次性令牌

def solve():
    from pyodide.http import open_url
    account_types_csv = open_url(____).read()
    payment_channels_csv = open_url(____).read()
    transaction_limits_csv = open_url(____).read()
    accounts_csv = open_url(____).read()
    transfers_csv = open_url(____).read()
    fraud_rules_csv = open_url(____).read()
    audit_logs_csv = open_url(____).read()
    import secrets
    token = secrets.token_hex(____)
    print(____)
    used_tokens = set()
    for i in range(____):
        if token in used_tokens:
            print(____)
        else:
            used_tokens.add(____)
            print(____)