Your factory can provide partial food subsidy by offering a discount voucher of specific value such as RM5/10 per meal depending on the staff level, the staff will be given a discount code based on the assigned discount value. Then, when the staff place order online, he will just need to enter the discount code upon ordering, the discount will be automatically calculated, the staff will just need pay the balance amount.
You can subsidise the staff with a total value of RM200-500 per month which will be comprised of RM5/10 discount voucher to be used within a validity of 1 month.