So we have to do nothing else than goin to the Lunar's Temple page and going to "prove our skills". That's it. The script makes the rest for us, showing and picking the right option, giving us the prices...

I got already like +250 Moon pavistones, Flans, Lotus leaves and so.

Shows me the phase of the moon correctly each time. Sometimes I select the wrong phase on purpose to keep Neopets guessing.