Is it obligatory to return the value of points gained from using a personal credit card for payments reimbursed by the employee from the employer back to the employer?

The employee must inform the employer of any discount or financial points obtained when purchasing tickets. If the employer permits, the employee may keep them. Otherwise, the employer is only obligated to pay the reduced price. The fact that the points or discount came about due to the employee's ownership of the card does not alter this; rather, the employee must always report the true price. If the points convert to cash, they are added to the ticket price to calculate its total cost.