In some cases RemNote will not be able to bill your credit card, preventing you from buying the pro subscription.
Please take these steps to fix this issue:
Please confirm with your bank that your credit card supports foreign/online payment, or
Try using another credit card. More about our payment methods here.
If you don’t have another credit card, you may also consider using a prepaid debit card like this: https://www.mastercard.co.uk/en-gb/personal/find-a-card/general-prepaid-mastercard.html. You can possibly find them in your local convenience store.
If none of these work, please contact support.