The cost of additional services (transfer, meals, and others) is included in the main invoice of the order.
If additional services were included in the invoice before it was settled, then settle the invoice in any way convenient.
If additional services were included in the invoice after it was settled, then the cost will be deducted from the overpayment.
Please make sure that the overpayment for the invoice matches the required amount. You may top up your overpayment balance by bank transfer or using a bank card.