Iexpense questions

Hello

question on the credit card from employee - where do you actually store the amex details of the employee(supplier) to be paid back when incurring expensed on these cards (and used for importing the details) - is that at supplier level (employee) or in hr ?

could someone also briefly explain the flow

in the case of an audit , eg we have iexpense reports and these are approved, and some of them , at random, eg 1 out of 5 will be audited

how does that flow go ?

-- > does this auditor receives these audits under his responsibility

--does he get a notification that he needs to check this