Work on TransactionListener.java

src/main/java/com/alttd/playershops/shop/PlayerShop.java

@@ -48,6 +48,9 @@ public class PlayerShop {
     private ItemStack itemStack;
     @Getter @Setter
     private long lastTransaction;
+    @Getter @Setter
+    private boolean notifiedOwner = false;
+
 
     public PlayerShop(Location shopLocation, Location signLocation, Player player) {
         this(shopLocation, signLocation, player.getUniqueId(), player.getName());