diff --git a/controller/boughtItem.js b/controller/boughtItem.js
new file mode 100644
index 0000000..8456677
--- /dev/null
+++ b/controller/boughtItem.js
@@ -0,0 +1,9 @@
+const {mongo} = require('mongoose');
+const BoughtItem = require('../models/BoughtItem');
+
+// Checks if the user owns a specific addon
+module.exports.ownsItem = async (user_id, addon_id) => {
+    if (!mongo.ObjectId.isValid(user_id)) return;
+    if (!mongo.ObjectId.isValid(addon_id)) return;
+    return await BoughtItem.findOne({user_id, addon_id}).exec() !== null;
+}
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