Who makes certificates/paperwork?

I was wondering who gives papers with there balls when they sell them to buyers. I was thinking of printing off something to go with the sales to prove they are one of mine etc.

How many people do this?

i dont sell, so naturally i have no need to give out paperwork...

but, most people only give paperwork for buyers who are buying hets (non visual morphs) because you obviosly would be able to tell if a morph was really a morph if it was visual