We currently only officially accept Japan-issued credit cards for purchasing our paid services.
Due to this policy, we are unfortunately unable to guarantee that you will have an issue-free payment experience using international (outside of Japan) credit and debit cards.
When seeing the “This credit/debit card is not supported. Please use a different card” message on your screen, it is most likely that your card is internationally-issued.
You may have been able to add an internationally-issued credit card; however, it may be rejected later, in which case your subscription will be canceled.
We are unable to answer any questions regarding supported internationally-issued credit cards because it depends on the credit card company/payment service agency. It is highly recommended you reach out to your credit card company/bank for more details.