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+# Slice 4: Customer Shopping Experience
+## Customers Browse and Shop on Vendor Stores
+
+**Status**: 📋 NOT STARTED  
+**Timeline**: Week 4 (5 days)  
+**Prerequisites**: Slices 1, 2, & 3 complete
+
+## 🎯 Slice Objectives
+
+Build the public-facing customer shop where customers can browse products, register accounts, and add items to cart.
+
+### User Stories
+- As a Customer, I can browse products on a vendor's shop
+- As a Customer, I can view detailed product information
+- As a Customer, I can search for products
+- As a Customer, I can register for a vendor-specific account
+- As a Customer, I can log into my account
+- As a Customer, I can add products to my shopping cart
+- As a Customer, I can manage my cart (update quantities, remove items)
+- Cart persists across sessions
+
+### Success Criteria
+- [ ] Customers can browse products without authentication
+- [ ] Product catalog displays correctly with images and prices
+- [ ] Product detail pages show complete information
+- [ ] Search functionality works
+- [ ] Customers can register vendor-specific accounts
+- [ ] Customer login/logout works
+- [ ] Shopping cart is functional with Alpine.js reactivity
+- [ ] Cart persists (session-based before login, user-based after)
+- [ ] Customer data is properly isolated by vendor
+- [ ] Mobile responsive design
+
+## 📋 Backend Implementation
+
+### Database Models
+
+#### Customer Model (`models/database/customer.py`)
+
+```python
+class Customer(Base, TimestampMixin):
+    """
+    Vendor-scoped customer accounts
+    Each customer belongs to ONE vendor
+    """
+    __tablename__ = "customers"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    vendor_id = Column(Integer, ForeignKey("vendors.id"), nullable=False)
+    
+    # Authentication
+    email = Column(String, nullable=False, index=True)
+    hashed_password = Column(String, nullable=False)
+    
+    # Personal information
+    first_name = Column(String)
+    last_name = Column(String)
+    phone = Column(String)
+    
+    # Customer metadata
+    customer_number = Column(String, unique=True, index=True)  # Auto-generated
+    
+    # Preferences
+    language = Column(String(2), default="en")
+    newsletter_subscribed = Column(Boolean, default=False)
+    marketing_emails = Column(Boolean, default=True)
+    preferences = Column(JSON, default=dict)
+    
+    # Statistics
+    total_orders = Column(Integer, default=0)
+    total_spent = Column(Numeric(10, 2), default=0)
+    
+    # Status
+    is_active = Column(Boolean, default=True)
+    email_verified = Column(Boolean, default=False)
+    last_login_at = Column(DateTime, nullable=True)
+    
+    # Relationships
+    vendor = relationship("Vendor", back_populates="customers")
+    addresses = relationship("CustomerAddress", back_populates="customer", cascade="all, delete-orphan")
+    orders = relationship("Order", back_populates="customer")
+    cart = relationship("Cart", back_populates="customer", uselist=False)
+    
+    # Indexes
+    __table_args__ = (
+        Index('ix_customer_vendor_email', 'vendor_id', 'email', unique=True),
+    )
+
+class CustomerAddress(Base, TimestampMixin):
+    """Customer shipping/billing addresses"""
+    __tablename__ = "customer_addresses"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    customer_id = Column(Integer, ForeignKey("customers.id"), nullable=False)
+    
+    # Address type
+    address_type = Column(String, default="shipping")  # shipping, billing, both
+    is_default = Column(Boolean, default=False)
+    
+    # Address details
+    first_name = Column(String)
+    last_name = Column(String)
+    company = Column(String)
+    address_line1 = Column(String, nullable=False)
+    address_line2 = Column(String)
+    city = Column(String, nullable=False)
+    state_province = Column(String)
+    postal_code = Column(String, nullable=False)
+    country = Column(String, nullable=False, default="LU")
+    phone = Column(String)
+    
+    # Relationships
+    customer = relationship("Customer", back_populates="addresses")
+```
+
+#### Cart Model (`models/database/cart.py`)
+
+```python
+class Cart(Base, TimestampMixin):
+    """Shopping cart - session or customer-based"""
+    __tablename__ = "carts"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    vendor_id = Column(Integer, ForeignKey("vendors.id"), nullable=False)
+    
+    # Owner (one of these must be set)
+    customer_id = Column(Integer, ForeignKey("customers.id"), nullable=True)
+    session_id = Column(String, nullable=True, index=True)  # For guest users
+    
+    # Cart metadata
+    currency = Column(String(3), default="EUR")
+    
+    # Relationships
+    vendor = relationship("Vendor")
+    customer = relationship("Customer", back_populates="cart")
+    items = relationship("CartItem", back_populates="cart", cascade="all, delete-orphan")
+    
+    # Computed properties
+    @property
+    def total_items(self) -> int:
+        return sum(item.quantity for item in self.items)
+    
+    @property
+    def subtotal(self) -> Decimal:
+        return sum(item.line_total for item in self.items)
+    
+    __table_args__ = (
+        Index('ix_cart_vendor_session', 'vendor_id', 'session_id'),
+        Index('ix_cart_vendor_customer', 'vendor_id', 'customer_id'),
+    )
+
+class CartItem(Base, TimestampMixin):
+    """Individual items in cart"""
+    __tablename__ = "cart_items"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    cart_id = Column(Integer, ForeignKey("carts.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    
+    # Item details
+    quantity = Column(Integer, nullable=False, default=1)
+    unit_price = Column(Numeric(10, 2), nullable=False)  # Snapshot at time of add
+    
+    # Relationships
+    cart = relationship("Cart", back_populates="items")
+    product = relationship("Product")
+    
+    @property
+    def line_total(self) -> Decimal:
+        return self.unit_price * self.quantity
+```
+
+### Pydantic Schemas
+
+#### Customer Schemas (`models/schema/customer.py`)
+
+```python
+class CustomerRegister(BaseModel):
+    """Customer registration"""
+    email: EmailStr
+    password: str = Field(..., min_length=8)
+    first_name: str
+    last_name: str
+    phone: Optional[str] = None
+    newsletter_subscribed: bool = False
+
+class CustomerLogin(BaseModel):
+    """Customer login"""
+    email: EmailStr
+    password: str
+
+class CustomerResponse(BaseModel):
+    """Customer details"""
+    id: int
+    vendor_id: int
+    email: str
+    first_name: str
+    last_name: str
+    phone: Optional[str]
+    customer_number: str
+    total_orders: int
+    total_spent: float
+    is_active: bool
+    created_at: datetime
+    
+    class Config:
+        from_attributes = True
+
+class CustomerAddressCreate(BaseModel):
+    """Create address"""
+    address_type: str = "shipping"
+    is_default: bool = False
+    first_name: str
+    last_name: str
+    company: Optional[str] = None
+    address_line1: str
+    address_line2: Optional[str] = None
+    city: str
+    state_province: Optional[str] = None
+    postal_code: str
+    country: str = "LU"
+    phone: Optional[str] = None
+
+class CustomerAddressResponse(BaseModel):
+    """Address details"""
+    id: int
+    address_type: str
+    is_default: bool
+    first_name: str
+    last_name: str
+    company: Optional[str]
+    address_line1: str
+    address_line2: Optional[str]
+    city: str
+    state_province: Optional[str]
+    postal_code: str
+    country: str
+    phone: Optional[str]
+    
+    class Config:
+        from_attributes = True
+```
+
+#### Cart Schemas (`models/schema/cart.py`)
+
+```python
+class CartItemAdd(BaseModel):
+    """Add item to cart"""
+    product_id: int
+    quantity: int = Field(..., gt=0)
+
+class CartItemUpdate(BaseModel):
+    """Update cart item"""
+    quantity: int = Field(..., gt=0)
+
+class CartItemResponse(BaseModel):
+    """Cart item details"""
+    id: int
+    product_id: int
+    product_title: str
+    product_image: Optional[str]
+    product_sku: str
+    quantity: int
+    unit_price: float
+    line_total: float
+    
+    class Config:
+        from_attributes = True
+
+class CartResponse(BaseModel):
+    """Complete cart"""
+    id: int
+    vendor_id: int
+    total_items: int
+    subtotal: float
+    currency: str
+    items: List[CartItemResponse]
+    
+    class Config:
+        from_attributes = True
+```
+
+### Service Layer
+
+#### Customer Service (`app/services/customer_service.py`)
+
+```python
+class CustomerService:
+    """Handle customer operations"""
+    
+    def __init__(self):
+        self.auth_manager = AuthManager()
+    
+    async def register_customer(
+        self,
+        vendor_id: int,
+        customer_data: CustomerRegister,
+        db: Session
+    ) -> Customer:
+        """Register new customer for vendor"""
+        
+        # Check if email already exists for this vendor
+        existing = db.query(Customer).filter(
+            Customer.vendor_id == vendor_id,
+            Customer.email == customer_data.email
+        ).first()
+        
+        if existing:
+            raise CustomerAlreadyExistsError("Email already registered")
+        
+        # Generate customer number
+        customer_number = self._generate_customer_number(vendor_id, db)
+        
+        # Create customer
+        customer = Customer(
+            vendor_id=vendor_id,
+            email=customer_data.email,
+            hashed_password=self.auth_manager.hash_password(customer_data.password),
+            first_name=customer_data.first_name,
+            last_name=customer_data.last_name,
+            phone=customer_data.phone,
+            customer_number=customer_number,
+            newsletter_subscribed=customer_data.newsletter_subscribed,
+            is_active=True
+        )
+        
+        db.add(customer)
+        db.commit()
+        db.refresh(customer)
+        
+        return customer
+    
+    async def authenticate_customer(
+        self,
+        vendor_id: int,
+        email: str,
+        password: str,
+        db: Session
+    ) -> Tuple[Customer, str]:
+        """Authenticate customer and return token"""
+        
+        customer = db.query(Customer).filter(
+            Customer.vendor_id == vendor_id,
+            Customer.email == email
+        ).first()
+        
+        if not customer:
+            raise InvalidCredentialsError()
+        
+        if not customer.is_active:
+            raise CustomerInactiveError()
+        
+        if not self.auth_manager.verify_password(password, customer.hashed_password):
+            raise InvalidCredentialsError()
+        
+        # Update last login
+        customer.last_login_at = datetime.utcnow()
+        db.commit()
+        
+        # Generate JWT token
+        token = self.auth_manager.create_access_token({
+            "sub": str(customer.id),
+            "email": customer.email,
+            "vendor_id": vendor_id,
+            "type": "customer"
+        })
+        
+        return customer, token
+    
+    def _generate_customer_number(self, vendor_id: int, db: Session) -> str:
+        """Generate unique customer number"""
+        # Format: VENDOR_CODE-YYYYMMDD-XXXX
+        from models.database.vendor import Vendor
+        
+        vendor = db.query(Vendor).get(vendor_id)
+        date_str = datetime.utcnow().strftime("%Y%m%d")
+        
+        # Count customers today
+        today_start = datetime.utcnow().replace(hour=0, minute=0, second=0)
+        count = db.query(Customer).filter(
+            Customer.vendor_id == vendor_id,
+            Customer.created_at >= today_start
+        ).count()
+        
+        return f"{vendor.vendor_code}-{date_str}-{count+1:04d}"
+```
+
+#### Cart Service (`app/services/cart_service.py`)
+
+```python
+class CartService:
+    """Handle shopping cart operations"""
+    
+    async def get_or_create_cart(
+        self,
+        vendor_id: int,
+        db: Session,
+        customer_id: Optional[int] = None,
+        session_id: Optional[str] = None
+    ) -> Cart:
+        """Get existing cart or create new one"""
+        
+        if customer_id:
+            cart = db.query(Cart).filter(
+                Cart.vendor_id == vendor_id,
+                Cart.customer_id == customer_id
+            ).first()
+        else:
+            cart = db.query(Cart).filter(
+                Cart.vendor_id == vendor_id,
+                Cart.session_id == session_id
+            ).first()
+        
+        if not cart:
+            cart = Cart(
+                vendor_id=vendor_id,
+                customer_id=customer_id,
+                session_id=session_id
+            )
+            db.add(cart)
+            db.commit()
+            db.refresh(cart)
+        
+        return cart
+    
+    async def add_to_cart(
+        self,
+        cart: Cart,
+        product_id: int,
+        quantity: int,
+        db: Session
+    ) -> CartItem:
+        """Add product to cart"""
+        
+        # Verify product exists and is active
+        product = db.query(Product).filter(
+            Product.id == product_id,
+            Product.vendor_id == cart.vendor_id,
+            Product.is_active == True
+        ).first()
+        
+        if not product:
+            raise ProductNotFoundError()
+        
+        # Check if product already in cart
+        existing_item = db.query(CartItem).filter(
+            CartItem.cart_id == cart.id,
+            CartItem.product_id == product_id
+        ).first()
+        
+        if existing_item:
+            # Update quantity
+            existing_item.quantity += quantity
+            db.commit()
+            db.refresh(existing_item)
+            return existing_item
+        else:
+            # Add new item
+            cart_item = CartItem(
+                cart_id=cart.id,
+                product_id=product_id,
+                quantity=quantity,
+                unit_price=product.price
+            )
+            db.add(cart_item)
+            db.commit()
+            db.refresh(cart_item)
+            return cart_item
+    
+    async def update_cart_item(
+        self,
+        cart_item_id: int,
+        quantity: int,
+        cart: Cart,
+        db: Session
+    ) -> CartItem:
+        """Update cart item quantity"""
+        
+        cart_item = db.query(CartItem).filter(
+            CartItem.id == cart_item_id,
+            CartItem.cart_id == cart.id
+        ).first()
+        
+        if not cart_item:
+            raise CartItemNotFoundError()
+        
+        cart_item.quantity = quantity
+        db.commit()
+        db.refresh(cart_item)
+        
+        return cart_item
+    
+    async def remove_from_cart(
+        self,
+        cart_item_id: int,
+        cart: Cart,
+        db: Session
+    ):
+        """Remove item from cart"""
+        
+        cart_item = db.query(CartItem).filter(
+            CartItem.id == cart_item_id,
+            CartItem.cart_id == cart.id
+        ).first()
+        
+        if not cart_item:
+            raise CartItemNotFoundError()
+        
+        db.delete(cart_item)
+        db.commit()
+    
+    async def clear_cart(self, cart: Cart, db: Session):
+        """Clear all items from cart"""
+        
+        db.query(CartItem).filter(CartItem.cart_id == cart.id).delete()
+        db.commit()
+    
+    async def merge_carts(
+        self,
+        session_cart_id: int,
+        customer_cart_id: int,
+        db: Session
+    ):
+        """Merge session cart into customer cart after login"""
+        
+        session_cart = db.query(Cart).get(session_cart_id)
+        customer_cart = db.query(Cart).get(customer_cart_id)
+        
+        if not session_cart or not customer_cart:
+            return
+        
+        # Move items from session cart to customer cart
+        for item in session_cart.items:
+            # Check if product already in customer cart
+            existing = db.query(CartItem).filter(
+                CartItem.cart_id == customer_cart.id,
+                CartItem.product_id == item.product_id
+            ).first()
+            
+            if existing:
+                existing.quantity += item.quantity
+            else:
+                item.cart_id = customer_cart.id
+        
+        # Delete session cart
+        db.delete(session_cart)
+        db.commit()
+```
+
+### API Endpoints
+
+#### Public Product Endpoints (`app/api/v1/public/vendors/products.py`)
+
+```python
+@router.get("", response_model=List[ProductResponse])
+async def get_public_products(
+    vendor_id: int,
+    category: Optional[str] = None,
+    search: Optional[str] = None,
+    min_price: Optional[float] = None,
+    max_price: Optional[float] = None,
+    skip: int = 0,
+    limit: int = 50,
+    db: Session = Depends(get_db)
+):
+    """Get public product catalog (no auth required)"""
+    
+    query = db.query(Product).filter(
+        Product.vendor_id == vendor_id,
+        Product.is_active == True
+    )
+    
+    if category:
+        query = query.filter(Product.category == category)
+    
+    if search:
+        query = query.filter(
+            or_(
+                Product.title.ilike(f"%{search}%"),
+                Product.description.ilike(f"%{search}%")
+            )
+        )
+    
+    if min_price:
+        query = query.filter(Product.price >= min_price)
+    
+    if max_price:
+        query = query.filter(Product.price <= max_price)
+    
+    products = query.order_by(
+        Product.is_featured.desc(),
+        Product.created_at.desc()
+    ).offset(skip).limit(limit).all()
+    
+    return products
+
+@router.get("/{product_id}", response_model=ProductResponse)
+async def get_public_product(
+    vendor_id: int,
+    product_id: int,
+    db: Session = Depends(get_db)
+):
+    """Get product details (no auth required)"""
+    
+    product = db.query(Product).filter(
+        Product.id == product_id,
+        Product.vendor_id == vendor_id,
+        Product.is_active == True
+    ).first()
+    
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+    
+    return product
+
+@router.get("/search")
+async def search_products(
+    vendor_id: int,
+    q: str,
+    db: Session = Depends(get_db)
+):
+    """Search products"""
+    # Implement search logic
+    pass
+```
+
+#### Customer Auth Endpoints (`app/api/v1/public/vendors/auth.py`)
+
+```python
+@router.post("/register", response_model=CustomerResponse)
+async def register_customer(
+    vendor_id: int,
+    customer_data: CustomerRegister,
+    db: Session = Depends(get_db)
+):
+    """Register new customer"""
+    service = CustomerService()
+    customer = await service.register_customer(vendor_id, customer_data, db)
+    return customer
+
+@router.post("/login")
+async def login_customer(
+    vendor_id: int,
+    credentials: CustomerLogin,
+    db: Session = Depends(get_db)
+):
+    """Customer login"""
+    service = CustomerService()
+    customer, token = await service.authenticate_customer(
+        vendor_id, credentials.email, credentials.password, db
+    )
+    
+    return {
+        "access_token": token,
+        "token_type": "bearer",
+        "customer": CustomerResponse.from_orm(customer)
+    }
+```
+
+#### Cart Endpoints (`app/api/v1/public/vendors/cart.py`)
+
+```python
+@router.get("/{session_id}", response_model=CartResponse)
+async def get_cart(
+    vendor_id: int,
+    session_id: str,
+    current_customer: Optional[Customer] = Depends(get_current_customer_optional),
+    db: Session = Depends(get_db)
+):
+    """Get cart (session or customer)"""
+    service = CartService()
+    cart = await service.get_or_create_cart(
+        vendor_id,
+        db,
+        customer_id=current_customer.id if current_customer else None,
+        session_id=session_id if not current_customer else None
+    )
+    return cart
+
+@router.post("/{session_id}/items", response_model=CartItemResponse)
+async def add_to_cart(
+    vendor_id: int,
+    session_id: str,
+    item_data: CartItemAdd,
+    current_customer: Optional[Customer] = Depends(get_current_customer_optional),
+    db: Session = Depends(get_db)
+):
+    """Add item to cart"""
+    service = CartService()
+    cart = await service.get_or_create_cart(vendor_id, db, current_customer.id if current_customer else None, session_id)
+    item = await service.add_to_cart(cart, item_data.product_id, item_data.quantity, db)
+    return item
+```
+
+## 🎨 Frontend Implementation
+
+### Templates
+
+#### Shop Homepage (`templates/shop/home.html`)
+
+```html
+{% extends "shop/base_shop.html" %}
+
+{% block content %}
+<div x-data="shopHome()" x-init="loadFeaturedProducts()">
+    <!-- Hero Section -->
+    <div class="hero-section">
+        <h1>Welcome to {{ vendor.name }}</h1>
+        <p>{{ vendor.description }}</p>
+        <a href="/shop/products" class="btn btn-primary btn-lg">
+            Shop Now
+        </a>
+    </div>
+    
+    <!-- Featured Products -->
+    <div class="products-section">
+        <h2>Featured Products</h2>
+        <div class="product-grid">
+            <template x-for="product in featuredProducts" :key="product.id">
+                <div class="product-card">
+                    <a :href="`/shop/products/${product.id}`">
+                        <img :src="product.featured_image || '/static/images/no-image.png'" 
+                             :alt="product.title">
+                        <h3 x-text="product.title"></h3>
+                        <p class="price">€<span x-text="product.price.toFixed(2)"></span></p>
+                    </a>
+                    <button @click="addToCart(product.id)" class="btn btn-primary btn-sm">
+                        Add to Cart
+                    </button>
+                </div>
+            </template>
+        </div>
+    </div>
+</div>
+{% endblock %}
+```
+
+#### Product Detail (`templates/shop/product.html`)
+
+```html
+{% extends "shop/base_shop.html" %}
+
+{% block content %}
+<div x-data="productDetail()" x-init="loadProduct()">
+    <div class="product-detail">
+        <!-- Product Images -->
+        <div class="product-images">
+            <img :src="product.featured_image" :alt="product.title" class="main-image">
+        </div>
+        
+        <!-- Product Info -->
+        <div class="product-info">
+            <h1 x-text="product.title"></h1>
+            <div class="price-section">
+                <span class="price">€<span x-text="product.price"></span></span>
+                <template x-if="product.compare_at_price">
+                    <span class="compare-price">€<span x-text="product.compare_at_price"></span></span>
+                </template>
+            </div>
+            
+            <div class="product-description" x-html="product.description"></div>
+            
+            <!-- Quantity Selector -->
+            <div class="quantity-selector">
+                <label>Quantity</label>
+                <input 
+                    type="number" 
+                    x-model.number="quantity"
+                    :min="1"
+                    :max="product.stock_quantity"
+                >
+                <span class="stock-info" x-text="`${product.stock_quantity} in stock`"></span>
+            </div>
+            
+            <!-- Add to Cart -->
+            <button 
+                @click="addToCart()"
+                class="btn btn-primary btn-lg"
+                :disabled="!canAddToCart || adding"
+            >
+                <span x-show="!adding">Add to Cart</span>
+                <span x-show="adding" class="loading-spinner"></span>
+            </button>
+        </div>
+    </div>
+</div>
+
+<script>
+    window.productId = {{ product.id }};
+    window.vendorId = {{ vendor.id }};
+</script>
+{% endblock %}
+
+{% block extra_scripts %}
+<script>
+function productDetail() {
+    return {
+        product: {},
+        quantity: 1,
+        adding: false,
+        loading: false,
+        
+        get canAddToCart() {
+            return this.product.stock_quantity >= this.quantity && this.quantity > 0;
+        },
+        
+        async loadProduct() {
+            this.loading = true;
+            try {
+                this.product = await apiClient.get(
+                    `/api/v1/public/vendors/${window.vendorId}/products/${window.productId}`
+                );
+            } catch (error) {
+                showNotification('Failed to load product', 'error');
+            } finally {
+                this.loading = false;
+            }
+        },
+        
+        async addToCart() {
+            this.adding = true;
+            try {
+                const sessionId = getOrCreateSessionId();
+                await apiClient.post(
+                    `/api/v1/public/vendors/${window.vendorId}/cart/${sessionId}/items`,
+                    {
+                        product_id: this.product.id,
+                        quantity: this.quantity
+                    }
+                );
+                
+                showNotification('Added to cart!', 'success');
+                updateCartCount();  // Update cart icon
+            } catch (error) {
+                showNotification(error.message || 'Failed to add to cart', 'error');
+            } finally {
+                this.adding = false;
+            }
+        }
+    }
+}
+</script>
+{% endblock %}
+```
+
+#### Shopping Cart (`templates/shop/cart.html`)
+
+Full Alpine.js reactive cart with real-time totals and quantity updates.
+
+## ✅ Testing Checklist
+
+### Backend Tests
+- [ ] Customer registration works
+- [ ] Duplicate email prevention works
+- [ ] Customer login/authentication works
+- [ ] Customer number generation is unique
+- [ ] Public product browsing works without auth
+- [ ] Product search/filtering works
+- [ ] Cart creation works (session and customer)
+- [ ] Add to cart works
+- [ ] Update cart quantity works
+- [ ] Remove from cart works
+- [ ] Cart persists across sessions
+- [ ] Cart merges after login
+- [ ] Vendor isolation maintained
+
+### Frontend Tests
+- [ ] Shop homepage loads
+- [ ] Product listing displays
+- [ ] Product search works
+- [ ] Product detail page works
+- [ ] Customer registration form works
+- [ ] Customer login works
+- [ ] Add to cart works
+- [ ] Cart updates in real-time (Alpine.js)
+- [ ] Cart icon shows count
+- [ ] Mobile responsive
+
+## ➡️ Next Steps
+
+After completing Slice 4, move to **Slice 5: Order Processing** to complete the checkout flow and order management.
+
+---
+
+**Slice 4 Status**: 📋 Not Started  
+**Dependencies**: Slices 1, 2, & 3 must be complete  
+**Estimated Duration**: 5 days