We're offering a credit card option but please note you will have to change interface to Japanese.
If you do not wish to use PayPal or can not for whatever reason, another option is to go through our Japanese interface to pay by credit card.
However, we can't guarantee that credit cards issued in other countries can be accepted by the payment service.
If you'd like to try, you can go to the iKnow! Pro Membership page and change the site language to Japanese (日本語) by clicking on the 日本語 inside the gear icon on the top right of the Home screen.
Since this payment option is only available in Japanese, please see the screenshots below for the payment flow.
1. Select the contract and click "決済に進む"(proceed the payment).
2. Select the payment method
3. Enter your credit card info
4. Confirm the entered info
5. You will see this message when the transaction is proceeded.