Unity Asset exchange between 2 different builds

Hello, I am looking for a Unity developer that allow to communicate two different Unity builds. Basically I want to show two different PC build communicating to each other sending and receiving 3d asset. To make this easiest as much as possible, I though to this solution: 2 builds 2 users Creation of a table/database of, for example, 10 assets (5 per user) that can be exchange among the two players. The builds give the possibility to login. Once the player login in the scene download the "backend database" where is written what he has in its catalogue/inventory. He can place in the scene only what he has in the catalogue. The player1 can send one of its assets to the player2. Once made that, the "backend database" is updated and now the player1 will not have anymore access to that asset. Instead when the player2 login in the scene, he will download the updated inventory and he will have its 5 assets plus the new one to place in the scene. The database should be online and accessible every time a player is entering in the scene and upgradeable in Realtime every time the player is sending a furniture to the other player We already have the two Unity Projects and the UI layout for the login/inventory etc.