When setting up a vendor block to sell items, there should be a warning if you try to put a Universal Card (instead of an Ender Card) into the block to sell items, because it's not obvious that only the Ender Card will send the coins on to your account.
(It could also simply prevent you from placing the ender card into the Vending Block.)
When setting up a vendor block to sell items, there should be a warning if you try to put a Universal Card (instead of an Ender Card) into the block to sell items, because it's not obvious that only the Ender Card will send the coins on to your account.
(It could also simply prevent you from placing the ender card into the Vending Block.)