If you choose to ship your packages with Parcel Monkey they will be shipped DDU (Delivered Duty Unpaid) which means it is the responsibility of the recipient to pay any customs duty.
When shipping internationally, you must provide accurate contact details for the recipient so that customs officers can take payment of any customs duty owed and release the parcel for delivery. You should provide a local landline number and an accurate email address. Failure to do this can see the package being delayed or returned to the sender.
Customs will contact the recipient and set up the payment with them. Once paid the package can be released and put out for delivery.
You should always attach your customs forms to the outside of the box, so customs officers can easily check the value of the contents and work out the customs duty.
You can find further customs advice here.