決済

1. Origins, structure, and basic meaning

• Structure: 決済 (けっさい) is settlement that completes payment. 決済した is the act; 決済方法 is a compound for the means or procedure.
• Basic usage: A product price is settled by card, and a payment method is selected on an order screen.

2. Common pitfalls and similar expressions

• Completed card payment and method selected
  • The payable item is 代金を; the instrument is カードで. Adding 方法 shifts focus from the transaction to the available way of paying.