Card payment failures for Viralpep subscriptions can occur for various reasons, including incorrect billing information, incorrect card type, transactions marked as fraud by the bank, expired cards, browser cache issues, or specific issues related to India-based credit cards. If you encounter any payment issues with Viralpep, please contact our support team at support@viralpep.com for assistance. They will guide you through the troubleshooting process and provide the necessary support to resolve the payment issue.