How to mark a deck of bicycle cards

Marked decks have been widely used by people all over the world to poker games or magician performance show. Bicycle marked decks are one kind.
Bicycle playing cards, manufactured by USPS, which has won its reputation as one of the best card brands around the world. How to mark a deck of Bicycle cards? It is not so good marked cards by hand with invisible ink for playing cards. In sum, marking cards with invisible ink requires technology. But, we have technology and high quality cards marking ink to poker decks. Why not buy Bicycle marked deck directly from us?