Selling using packets

I know that it will be possible to sell items using packets in near future , looking at the recode (gw2ca) lua functions it will be very easy to write simple and very fast script . But what can we do now is there any possibilities to write it now ? Maybe some guidelines what need to be done to achieve it ? I want to learn and write this kind of selling tool as it will help with alot of situations when flipping so gladly i will accept any help or pay for guide

Reverse the game and get the function that encrypt/decrypt packets, decrypt the data, reverse the data and build your own packets containing your own information. Either hook the encrypt function or port the asm implementation to the language of your choice and send the packets using an io client/server library.