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, If you wish to deactivate account, you can do so through the Control Panel.
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.
When you register your credit card, you may be notified that a 50 yen charge has been received to verify the validity of your credit card, but this 50 yen charge will be immediately returned. Don't worry. 50 yen will not be withdrawn from your account.