diff --git a/classes/Auth.js b/classes/Auth.js
index e69de29..11f6fec 100644
--- a/classes/Auth.js
+++ b/classes/Auth.js
@@ -0,0 +1,16 @@
+const Customer = require("./Customer.js")
+
+class Auth{
+    constructor(){
+        this.customers = []
+    }
+    register(name, email, shippingAddress){
+        let newCustomer = new Customer(name, email, shippingAddress)
+        this.customers.push(newCustomer)
+    }
+    login(email){
+        return this.customers.find(customer => customer.email === email) || null 
+    }
+}
+
+module.exports = Auth
\ No newline at end of file
diff --git a/classes/Cart.js b/classes/Cart.js
index e69de29..c2fdf39 100644
--- a/classes/Cart.js
+++ b/classes/Cart.js
@@ -0,0 +1,18 @@
+class Cart{
+    constructor(){
+        this.products = []
+        this.total = 0
+    }
+    addProduct (product){
+       this.products.push(product)
+       this.total += product.price
+    }
+    removeProduct(i){
+        if(i >= 0 && i < this.products.length){
+            const removeProduct = this.products.splice(i, 1)[0]
+            this.total -=  removeProduct.price
+        }
+    }
+}
+
+module.exports = Cart
\ No newline at end of file
diff --git a/classes/Customer.js b/classes/Customer.js
index e69de29..673f306 100644
--- a/classes/Customer.js
+++ b/classes/Customer.js
@@ -0,0 +1,13 @@
+class Customer{
+    constructor(name, email, shippingAddress){
+        this.name =  name
+        this.email = email
+        this.shippingAddress = shippingAddress
+        this.orderHistory = []
+    }
+    addToOrderHistory(cart){
+        this.orderHistory.push(cart)
+    }
+}
+
+module.exports = Customer
\ No newline at end of file
diff --git a/classes/Product.js b/classes/Product.js
index e69de29..105d8dc 100644
--- a/classes/Product.js
+++ b/classes/Product.js
@@ -0,0 +1,13 @@
+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
\ No newline at end of file