PayPal is a payment method that lets people make payments only with an ID and password just by registering your credit card (VISA, MASTER, JCB, and AMEX) or debit card and bank account information to a PayPal account.
For details, please check the official PayPal website.
PayPal
https://www.paypal.com/jp/webapps/mpp/personal
If you have a PayPal account, when registering a payment method, you can log in with your PayPal to make a payment.
Even if you do not have a PayPal account, you can create a PayPal account and pay with PayPal.