ExpenseTron pushes all approved expenses as purchase bills pending payment in Xero. This allows your accounting team to review them before marking them as paid. The categories of these bills are also the ones defined as Expense categories in your chart of accounts. 

When your accounting team marks bills as paid in Xero, ExpenseTron will update the expense owner (employee that created the expense) and the manager (the one who approved the expense) that the bill has been paid. 

This way you can keep all expense creation, deletion and updates for all the employees in ExpenseTron, while reimbursement and reconciliation can remain with your accounting team.