Yes! It's possible to do that. I've received mine through RSorder which was a great shopping Experience for me. I received my 300 million OSRS Gold within three minutes. It's a simple process too, just make an order and then pay for it.
When I spoke with their customer service and was advised of the exact location and particular person I needed to be looking for. When I visited that location, it was clear whom I needed to talk to first. Within less than a minute the gold purchase was transferred to me, and I was able purchase more powerful armour and weapons for my primary.