Omastar's name is a combination of a phonetic anagram of ammonite and star (based on its body shape).

Omstar is a combination of オウムガイ ōmugai (nautilus) and star.

I just started my online business with perfect money as one of my payment method, but how do I create a payment option for my customers ?

(It similar where you buy an item online and just put how much money you would pay and then just click "buy now", something like that)