Most often the issue is manual entry error and the number hasn't been put incorrectly. We would first recommend trying the same card number again.
If you clinic is part of our network, they also now have the ability to generate a Virtual Card on your behalf at check-out. If you don't have access to your GoFetch Health app or are facing any issue generating your virtual card, they can assist you.
If you are still experiencing issue, please contact our customer support team via the chat.