If you don’t have a Paypal account, you have the option of paying with a credit/debit card, as you would on a traditional bank interface. To do this, click on the link circled in the screen capture below. That will redirect you to a secured interface where you can enter your bank information and thus end the transaction safely.

In both cases, your bank information will never be stored or even accessible by the staff from BIG IN JAPAN. So don't worry about making those online purchases !