What is Amazon Charge?
It is a service where you can reload your Gift Cards balance with various payment methods. You will only spend what you reloaded, so it is useful to control your budget. Also, you will be able to shop on Amazon without a credit card.
How do I pay?
In addition to credit cards and debit cards, you can also pay with convenience store/ATM/net banking, so it is recommended to those who do not have a credit card.