Understanding Per Diem Allowances
Per diem is determined by the daily costs incurred by an employee while working in a different location. It includes expenses related to the standard of living of the city and business project valuation. You may calculate the amount with respect to the country where the employee is located. For example, it's in INR for Indian employees, whereas it would be in USD for employees in the US. MNCs maintain a common sheet in USD to create parity.
Do arrange for an initial amount within the office, which the employee would collect before leaving. Thereafter, you may allow the employee to use the Diners Club, Amex, or whichever credit card is issued to employees who are traveling. The employee needs to be issued a letter mentioning the project date and the amount of per diem allowed. Later on, the employee needs to apply for reimbursements through your ERP and pay the credit card bills.
Cost of Living in Shanghai, China. Prices in Shanghai.
Xpatulator - Cost of Living Index Calculator
http://www.libraries.rutgers.edu/rul..._diem_2010.pdf
Per Diem Calculator, IATA Airport Codes Linked to Cities