When attempting to purchase items, players still need to have the money physically in their inventory despite the Economics integration being enabled. The purchase goes through, the money is deducted from the Economics account, but the cash item in the player’s inventory remains untouched.

Thanks for reporting the issue. I reproduced the issue and found the root cause. I released a fix just now.

As for what happened, since vending machines now natively support skinned currency, the plugin integrates with that feature. As a result, the Rust client now requires the player to have the custom currency item with the correct skin in their inventory. The plugin previously got around inventory requirements by sending fake inventory snapshots to the Rust client, but those snapshots included only the required item id, not the required skin, so the Rust client judged the player as not having the right currency.