Prevent PO Boxes in shipping address field on Checkout

We recently integrated a feature that would prevent users from creating an order with a PO Box in Australia. Since we are already familiar with Australia Post shipping integration (and heavy modifications of it, I might add :)), the first thing that came to mind is to have a look if there’s some API or web interface that can be used to filter out post codes that are linked to PO Boxes. Many high volume addresses and/or PO Boxes in Australia have their own post code, so it looked like an obvious solution. It turns out that it’s not that simple or logical, since there are many edge cases where you can not reliably tell if you should filter the code out or not. There is a guide made by Fontis that shows how to validate the input fields in order to filter out PO Boxes. However, in our case we had some dynamic content loading with Temando shipping method integrated. This guide is intended as a more general solution that is compatible with Checkout page’s dynamic content and third party Shipping methods integration like Temando.

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