diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..5834120
Binary files /dev/null and b/.DS_Store differ
diff --git a/.gitignore b/.gitignore
index e69de29..723ef36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
\ No newline at end of file
diff --git a/src/main.py b/src/main.py
index 1df8c46..bfe3a86 100644
--- a/src/main.py
+++ b/src/main.py
@@ -12,6 +12,8 @@ def validorder(order: Order):
             net += item.amount
         elif item.type == "product":
             net -= item.amount * item.quantity
+        elif item.type == "shipping":
+            net -= item.amount
         else:
             return "Invalid item type: %s" % item.type