Registration and change of credit card information usage for payment is accepted from the payment information page on the control panel, but you can not delete credit card information.
You have to leave your credit card information in order to continuingly use Arukas service. If you want to remove your credit card information, we deactive your account. Please contact us if it is necessary.
Payment information page:
We use an authentication mechanism to check the validity of credit card. Repeatedly mistake entering credit card information may cause not accept credit card registration operations for a certain period of time. In that case, please wait for a while and retry to register your credit card information again.
Have you received a charge 50 yen (JPY) billing notice from your credit card company? The 50JPY billing you know may be a fake request created by the authentication mechanism. That 50JPY billing is fake, and will never actually be paid from your bank account.