Wouldn't do that for few reasons.
First of all, unlike cash you need to pay here taxes and probably a lot more then just taxes if you are buying from a foreign country.

Not only that, if you are a foreign customer you are also taking the risk that the package will be place on held by the local authorities, and you probably won't get any refund from the company who issued the gold.

And the 3rd point is that you can't really know if the gold you are receiving is real, and as far as I checked out it doesn't come with any document that proves the authenticate of the gold.
Stay away.