Solved ContainerSetSlotPacket with fake chest

Hi all, I would like to create a shop in fake chest
My steps:
1) Send "fake chest" to player
2) Send "ContainerOpenPacket"
3) Send "ContainerSetContentPacket" with items
4) I start "tracking" "ContainerSetSlotPacket" from the player
5) Now I must identify player transaction from chest to player inventory
6) After purchase, I need send chest inventory again and updated player inventory

I have a question: how can I identify, when player take from chest and when player place to chest?

 

You can listen for InventoryTransactionEvent.

 

Tnk for that, but this is not true, because as I use "fake chest" ans send Packet - server will think, that client send error packet
But I think, that I solve it