I'm experiencing backend functionality issues on my CS-Cart platform, specifically with order processing. The primary problem is with payment processing, and I need this resolved urgently to ensure smooth business operations. Key Requirements: - Expertise in CS-Cart, particularly in backend functionalities - Proven experience in troubleshooting and fixing payment processing issues - Ability to diagnose and resolve the root cause of the problem - Quick turnaround time is essential I've encountered an error with CSCART when customers attempt to purchase an item it gives an error: Result: 7; Invalid Request. Malicious string found in XML document: <U"<X T="4" v=". Please remove and retry transaction.; We use paypal payflow pro as the credit card processor.