Not using any app, a URL medium including a vault URL containing a property of an ID of a user is used during a user confirmation process and a transaction request process (a payment request process or a charging request process), and transaction (a payment or a charging) is made using money from an external device (a URL vault account), not the URL medium. A URL medium can support a way of requesting a transaction (a payment or a charging) after checking a user, or can support a way of confirming a user after requesting a transaction (a payment or a charging). A URL medium can support offline transactions and online transactions, and two URL medium (a URL medium-B of a buyer and a URL medium-S of a seller) can support offline transactions that do not use a POS (a URL POS). A URL medium can also support transactions that temporarily approve a payment.