Hallo! So i have a question. I have 10 slots for items in my shop ( im free user) . What will be if i will put 2 games for 6 keys each and someone will buy them... Will i get 12 keys , or i will get 10 keys and another 2 keys will be deleted ???

PS: 2x6=12 max space is 10 . Where will be 2 other keys?

You can temporarily hold the items in the shop but you won't be able to sell any more items until you take away enough items to put you under the limit.