Please explain what Apptricity Expense Management is and provide an overview of its functionality. Apptricity Expense Management automates various aspects of travel and expense management, such as travel approval and booking, expense entry and approvals, and audit and reporting. The system also helps enforce company policies by encouraging employees to use preferred vendors. With comprehensive real-time reporting, users can make more informed budget and spending decisions quickly. The system is accessible through mobile and web interfaces, allowing for easy creation, tracking, approval, and audit of expense reports. Additionally, users can conveniently scan and download receipts, promoting faster submission of reports and encouraging widespread adoption within the company.