How to fill in the 9-digit bank code registered with Amazon:

1. Log in to Amazon, click Settings and select your account information.

2. Click Payment Information to select a deposit method.

3. Add a deposit account method. For example, select Japan as the country where the bank account is located. You can use a bank account in any country and currency supported by Amazon's currency conversion service.

4. Add your deposit method. For bank accounts located in countries other than Japan, such as the United States.

5. Then click the Submit option to fill in the 9-digit bank code registered with Amazon.