I tried to program a shop-system in OC with the help of enderio, TE and AE storage system.
It works like this: one player has his OC-PC and can use that to access the OC-Server in the Shop to buy/sell things. The items are being send/received with a tesseract that belongs to the shop owner. In the shop the system is distributed on 4 systems.
I add a few pictures on my github: https://github.com/kevinkk525/OC-tools/issues/1
Sadly the code is not completely done. The shop owner /server part is almost complete and works perfectly. Items can be bought and sold. Just the energy rental is not