Troubleshoot and resolve unexpected client details on an invoice.
Troubleshoot and resolve unexpected changes to a service's Next Due Date value.
Troubleshoot and resolve issues with customers receiving unexpected subscription cancellation emails from PayPal®.
Troubleshoot and resolve unexplained declined cards and failures.
Troubleshoot and resolve transactions that the system isn't recording.
Troubleshoot and resolve The sender's email address is not registered. (WHMCS 8.4 and later) or Unregistered Email Address (WHMCS 8.3 and earlier) errors.
Troubleshoot and resolve issues with sending general emails to clients.