Add postage calculator into auction site.
The end result required is that when a registered user list an item for sale, I want them to be able to input Dimensions and weight of the item being sold/auctioned. I need that when a buyer is looking at an item they can calculate what the postage will be to their postcode. Australia Post API key is ready. So the database must be able to pull the postcode of the seller and item dimensions and weight, this will need to be called on for each item in the site.
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