diff --git a/classes/Auth.js b/classes/Auth.js
index e69de29..4170e3c 100644
--- a/classes/Auth.js
+++ b/classes/Auth.js
@@ -0,0 +1,19 @@
+const Customer = require("./Customer");
+
+class Auth {
+  constructor() {
+    this.customers = [];
+  }
+
+  register(name, email, shippingAddress) {
+    const newCustomer = new Customer(name, email, shippingAddress);
+    this.customers.push(newCustomer);
+    return newCustomer;
+  }
+
+  login(email) {
+    return this.customers.find((customer) => customer.email === email) || null;
+  }
+}
+
+module.exports = Auth;
diff --git a/classes/Cart.js b/classes/Cart.js
index e69de29..00a7b62 100644
--- a/classes/Cart.js
+++ b/classes/Cart.js
@@ -0,0 +1,23 @@
+const Product = require("./Product");
+
+class Cart {
+  constructor() {
+    this.products = [];
+    this.total = 0;
+  }
+
+  addProduct(product) {
+    if (product instanceof Product) {
+      this.products.push(product);
+      this.total += product.price;
+    }
+  }
+
+  removeProduct(i) {
+    if (i > this.products.length) return "Product is no longer in stock";
+    this.total -= this.products[i].price;
+    this.products.splice(i, 1);
+  }
+}
+
+module.exports = Cart;
diff --git a/classes/Customer.js b/classes/Customer.js
index e69de29..629ad8a 100644
--- a/classes/Customer.js
+++ b/classes/Customer.js
@@ -0,0 +1,18 @@
+const Cart = require("./Cart");
+
+class Customer {
+  constructor(name, email, shippingAddress) {
+    this.name = name;
+    this.email = email;
+    this.shippingAddress = shippingAddress;
+    this.orderHistory = [];
+  }
+
+  addToOrderHistory(cart) {
+    if (cart instanceof Cart) {
+      this.orderHistory.push(cart);
+    }
+  }
+}
+
+module.exports = Customer;
diff --git a/classes/Product.js b/classes/Product.js
index e69de29..1236d56 100644
--- a/classes/Product.js
+++ b/classes/Product.js
@@ -0,0 +1,14 @@
+class Product {
+  constructor(name, price, description) {
+    this.name = name;
+    this.price = price;
+    this.description = description;
+    this.inStock = true;
+  }
+
+  display() {
+    return `Name: ${this.name}, Price: $${this.price}, Description: ${this.description}`;
+  }
+}
+
+module.exports = Product;
diff --git a/index.js b/index.js
index efad601..495418d 100644
--- a/index.js
+++ b/index.js
@@ -1,49 +1,36 @@
 // Import Classes Here
-
-
-
-
-
-
-
-
-
+const Product = require("./classes/Product");
+const Cart = require("./classes/Cart");
+const Customer = require("./classes/Customer");
+const Auth = require("./classes/Auth");
 
 // DO NOT EDIT BELOW THIS LINE
 try {
-    module.exports = {
-        Product,
-    }
-} catch(e){
-
-}
+  module.exports = {
+    Product,
+  };
+} catch (e) {}
 
 try {
-    module.exports = {
-        Product,
-        Cart
-    }
-} catch(e){
-
-}
+  module.exports = {
+    Product,
+    Cart,
+  };
+} catch (e) {}
 
 try {
-    module.exports = {
-        Product,
-        Cart,
-        Customer
-    }
-} catch(e){
-
-}
+  module.exports = {
+    Product,
+    Cart,
+    Customer,
+  };
+} catch (e) {}
 
 try {
-    module.exports = {
-        Product,
-        Cart,
-        Customer,
-        Auth
-    }
-} catch(e){
-
-}
\ No newline at end of file
+  module.exports = {
+    Product,
+    Cart,
+    Customer,
+    Auth,
+  };
+} catch (e) {}
diff --git a/package-lock.json b/package-lock.json
index 9b68881..5713249 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4717,7 +4717,8 @@
     "jest-pnp-resolver": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/jest-pnp-resolver/-/jest-pnp-resolver-1.2.3.tgz",
-      "integrity": "sha512-+3NpwQEnRoIBtx4fyhblQDPgJI0H1IEIkX7ShLUjPGA7TtUTvI1oiKi3SR4oBR0hQhQR80l4WAe5RrXBwWMA8w=="
+      "integrity": "sha512-+3NpwQEnRoIBtx4fyhblQDPgJI0H1IEIkX7ShLUjPGA7TtUTvI1oiKi3SR4oBR0hQhQR80l4WAe5RrXBwWMA8w==",
+      "requires": {}
     },
     "jest-regex-util": {
       "version": "29.4.3",