Inheritance: extends AddressCheckoutComponent
 public function __construct(Order $order)
 {
     parent::__construct($order);
     $this->addComponent(CustomerDetailsCheckoutComponent::create());
     $this->addComponent(ShippingAddressCheckoutComponent::create());
     $this->addComponent(BillingAddressCheckoutComponent::create());
     if (Checkout::member_creation_enabled() && !Member::currentUserID()) {
         $this->addComponent(MembershipCheckoutComponent::create());
     }
     if (count(GatewayInfo::getSupportedGateways()) > 1) {
         $this->addComponent(PaymentCheckoutComponent::create());
     }
     $this->addComponent(NotesCheckoutComponent::create());
     $this->addComponent(TermsCheckoutComponent::create());
 }
 public function billingconfig()
 {
     $config = new CheckoutComponentConfig(ShoppingCart::curr());
     $config->addComponent(BillingAddressCheckoutComponent::create());
     return $config;
 }