Repair Magento Payment Capture

Our magento cart has been working fine with [login to view URL] for sometime but now it is no longer working with a "Payment Capturing Error". [login to view URL] has confirmed the issue is not on their end. I need someone who can debug the problem and resolve it. This issue needs to be resolved today. If you cannot manage that please do not bid. Site details, access information and [login to view URL] info will be provided upon bid acceptance. Please be sure to indicate your experience with magento in your bid.