_order', 0 );
	}

	/**
	 * Updates draft order data in the customer session.
	 *
	 * @param integer $order_id Draft order ID.
	 */
	private function set_draft_order_id( $order_id ) {
		wc()->session->set( 'store_api_draft_order', $order_id );
	}

	/**
	 * Whether the passed argument is a draft order or an order that is
	 * pending/failed and the cart hasn't changed.
	 *
	 * @param \WC_Order $order_object Order object to check.
	 * @return boolean Whether the order is valid as a draft order.
	 */
	private function is_valid_draft_order( $order_object ) {
		if ( ! $order_object instanceof \WC_Order ) {
			return false;
		}

		// Draft orders are okay.
		if ( $order_object->has_status( 'checkout-draft' ) ) {
			return true;
		}

		// Pending and failed orders can be retried if the cart hasn't changed.
		if ( $order_object->needs_payment() && $order_object->has_cart_hash( wc()->cart->get_cart_hash() ) ) {
			return true;
		}

		return false;
	}

	/**
	 * Create or update a draft order based on the cart.
	 *
	 * @throws RouteException On error.
	 */
	private function create_or_update_draft_order() {
		$this->order = $this->get_draft_order_id() ? wc_get_order( $this->get_draft_order_id() ) : null;

		if ( ! $this->is_valid_draft_order( $this->order ) ) {
			$this->order = $this->order_controller->create_order_from_cart();
		} else {
			$this->order_controller->update_order_from_cart( $this->order );
		}

		/**
		 * Fires when the Checkout Block/Store API updates an order's meta data.
		 *
		 * This hook gives extensions the chance to add or update meta data on the $order.
		 *
		 * This is similar to existing core hook woocommerce_checkout_update_order_meta.
		 * We're using a new action:
		 * - To keep the interface focused (only pass $order, not passing request data).
		 * - This also explicitly indicates these orders are from checkout block/StoreAPI.
		 *
		 * @see https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3686
		 * @internal This Hook is experimental and may change or be removed.
		 *
		 * @param \WC_Order $order Order object.
		 *
		 * @deprecated 6.3.0 Use woocommerce_blocks_checkout_update_order_meta instead.
		 */
		wc_do_deprecated_action(
			'__experimental_woocommerce_blocks_checkout_update_order_meta',
			array(
				$this->order,
			),
			'6.3.0',
			'woocommerce_blocks_checkout_update_order_meta',
			'This action was deprecated in WooCommerce Blocks version 6.3.0. Please use woocommerce_blocks_checkout_update_order_meta instead.'
		);

		/**
		 * Fires when the Checkout Block/Store API updates an order's meta data.
		 *
		 * This hook gives extensions the chance to add or update meta data on the $order.
		 *
		 * This is similar to existing core hook woocommerce_checkout_update_order_meta.
		 * We're using a new action:
		 * - To keep the interface focused (only pass $order, not passing request data).
		 * - This also explicitly indicates these orders are from checkout block/StoreAPI.
		 *
		 * @see https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3686
		 *
		 * @param \WC_Order $order Order object.
		 */
		do_action( 'woocommerce_blocks_checkout_update_order_meta', $this->order );

		// Confirm order is valid before proceeding further.
		if ( ! $this->order instanceof \WC_Order ) {
			throw new RouteException(
				'woocommerce_rest_checkout_missing_order',
				__( 'Unable to create order', 'woocommerce' ),
				500
			);
		}

		// Store order ID to session.
		$this->set_draft_order_id( $this->order->get_id() );

		// Try to reserve stock for 10 mins, if available.
		try {
			$reserve_stock = new ReserveStock();
			$reserve_stock->reserve_stock_for_order( $this->order, 10 );
		} catch ( ReserveStockException $e ) {
			$error_data = $e->getErrorData();
			throw new RouteException(
				$e->getErrorCode(),
				$e->getMessage(),
				$e->getCode()
			);
		}
	}

	/**
	 * Updates the current customer session using data from the request (e.g. address data).
	 *
	 * Address session data is synced to the order itself later on by OrderController::update_order_from_cart()
	 *
	 * @param \WP_REST_Request $request Full details about the request.
	 */
	private function update_customer_from_request( \WP_REST_Request $request ) {
		$customer = wc()->customer;

		if ( isset( $request['billing_address'] ) ) {
			foreach ( $request['billing_address'] as $key => $value ) {
				if ( is_callable( [ $customer, "set_billing_$key" ] ) ) {
					$customer->{"set_billing_$key"}( $value );
				}
			}
		}

		if ( isset( $request['shipping_address'] ) ) {
			foreach ( $request['shipping_address'] as $key => $value ) {
				if ( is_callable( [ $customer, "set_shipping_$key" ] ) ) {
					$customer->{"set_shipping_$key"}( $value );
				} elseif ( 'phone' === $key ) {
					$customer->update_meta_data( 'shipping_phone', $value );
				}
			}
		}

		$customer->save();
	}

	/**
	 * Update the current order using the posted values from the request.
	 *
	 * @param \WP_REST_Request $request Full details about the request.
	 */
	private function update_order_from_request( \WP_REST_Request $request ) {
		$this->order->set_customer_note( $request['customer_note'] ?? '' );
		$this->order->set_payment_method( $request['payment_method'] ?? '' );

		/**
		 * Fires when the Checkout Block/Store API updates an order's from the API request data.
		 *
		 * This hook gives extensions the chance to update orders based on the data in the request. This can be used in
		 * conjunction with the ExtendRestAPI class to post custom data and then process it.
		 *
		 * @internal This Hook is experimental and may change or be removed.
		 *
		 * @param \WC_Order $order Order object.
		 * @param \WP_REST_Request $request Full details about the request.
		 *
		 * @deprecated 6.3.0 Use woocommerce_blocks_checkout_update_order_from_request instead.
		 */
		wc_do_deprecated_action(
			'__experimental_woocommerce_blocks_checkout_update_order_from_request',
			array(
				$this->order,
				$request,
			),
			'6.3.0',
			'woocommerce_blocks_checkout_update_order_from_request',
			'This action was deprecated in WooCommerce Blocks version 6.3.0. Please use woocommerce_blocks_checkout_update_order_from_request instead.'
		);

		/**
		 * Fires when the Checkout Block/Store API updates an order's from the API request data.
		 *
		 * This hook gives extensions the chance to update orders based on the data in the request. This can be used in
		 * conjunction with the ExtendRestAPI class to post custom data and then process it.
		 *
		 * @param \WC_Order $order Order object.
		 * @param \WP_REST_Request $request Full details about the request.
		 */
		do_action( 'woocommerce_blocks_checkout_update_order_from_request', $this->order, $request );

		$this->order->save();
	}

	/**
	 * For orders which do not require payment, just update status.
	 *
	 * @param \WP_REST_Request $request Request object.
	 * @param PaymentResult    $payment_result Payment result object.
	 */
	private function process_without_payment( \WP_REST_Request $request, PaymentResult $payment_result ) {
		// Transition the order to pending, and then completed. This ensures transactional emails fire for pending_to_complete events.
		$this->order->update_status( 'pending' );
		$this->order->payment_complete();

		// Mark the payment as successful.
		$payment_result->set_status( 'success' );
		$payment_result->set_redirect_url( $this->order->get_checkout_order_received_url() );
	}

	/**
	 * Fires an action hook instructing active payment gateways to process the payment for an order and provide a result.
	 *
	 * @throws RouteException On error.
	 *
	 * @param \WP_REST_Request $request Request object.
	 * @param PaymentResult    $payment_result Payment result object.
	 */
	private function process_payment( \WP_REST_Request $request, PaymentResult $payment_result ) {
		try {
			// Transition the order to pending before making payment.
			$this->order->update_status( 'pending' );

			// Prepare the payment context object to pass through payment hooks.
			$context = new PaymentContext();
			$context->set_payment_method( $this->get_request_payment_method_id( $request ) );
			$context->set_payment_data( $this->get_request_payment_data( $request ) );
			$context->set_order( $this->order );

			/**
			 * Process payment with context.
			 *
			 * @hook woocommerce_rest_checkout_process_payment_with_context
			 *
			 * @throws \Exception If there is an error taking payment, an \Exception object can be thrown with an error message.
			 *
			 * @param PaymentContext $context        Holds context for the payment, including order ID and payment method.
			 * @param PaymentResult  $payment_result Result object for the transaction.
			 */
			do_action_ref_array( 'woocommerce_rest_checkout_process_payment_with_context', [ $context, &$payment_result ] );

			if ( ! $payment_result instanceof PaymentResult ) {
				throw new RouteException( 'woocommerce_rest_checkout_invalid_payment_result', __( 'Invalid payment result received from payment method.', 'woocommerce' ), 500 );
			}
		} catch ( \Exception $e ) {
			throw new RouteException( 'woocommerce_rest_checkout_process_payment_error', $e->getMessage(), 400 );
		}
	}

	/**
	 * Gets the chosen payment method ID from the request.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 * @return string
	 */
	private function get_request_payment_method_id( \WP_REST_Request $request ) {
		$payment_method_id = wc_clean( wp_unslash( $request['payment_method'] ?? '' ) );

		if ( empty( $payment_method_id ) ) {
			throw new RouteException(
				'woocommerce_rest_checkout_missing_payment_method',
				__( 'No payment method provided.', 'woocommerce' ),
				400
			);
		}

		return $payment_method_id;
	}

	/**
	 * Gets the chosen payment method from the request.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 * @return \WC_Payment_Gateway
	 */
	private function get_request_payment_method( \WP_REST_Request $request ) {
		$payment_method_id  = $this->get_request_payment_method_id( $request );
		$available_gateways = WC()->payment_gateways->get_available_payment_gateways();

		if ( ! isset( $available_gateways[ $payment_method_id ] ) ) {
			throw new RouteException(
				'woocommerce_rest_checkout_payment_method_disabled',
				__( 'This payment gateway is not available.', 'woocommerce' ),
				400
			);
		}

		return $available_gateways[ $payment_method_id ];
	}

	/**
	 * Gets and formats payment request data.
	 *
	 * @param \WP_REST_Request $request Request object.
	 * @return array
	 */
	private function get_request_payment_data( \WP_REST_Request $request ) {
		static $payment_data = [];
		if ( ! empty( $payment_data ) ) {
			return $payment_data;
		}
		if ( ! empty( $request['payment_data'] ) ) {
			foreach ( $request['payment_data'] as $data ) {
				$payment_data[ sanitize_key( $data['key'] ) ] = wc_clean( $data['value'] );
			}
		}

		return $payment_data;
	}

	/**
	 * Order processing relating to customer account.
	 *
	 * Creates a customer account as needed (based on request & store settings) and  updates the order with the new customer ID.
	 * Updates the order with user details (e.g. address).
	 *
	 * @throws RouteException API error object with error details.
	 * @param \WP_REST_Request $request Request object.
	 */
	private function process_customer( \WP_REST_Request $request ) {
		try {
			$create_account = Package::container()->get( CreateAccount::class );
			$create_account->from_order_request( $request );
			$this->order->set_customer_id( get_current_user_id() );
			$this->order->save();
		} catch ( \Exception $error ) {
			switch ( $error->getMessage() ) {
				case 'registration-error-invalid-email':
					throw new RouteException(
						'registration-error-invalid-email',
						__( 'Please provide a valid email address.', 'woocommerce' ),
						400
					);
				case 'registration-error-email-exists':
					throw new RouteException(
						'registration-error-email-exists',
						__( 'An account is already registered with your email address. Please log in before proceeding.', 'woocommerce' ),
						400
					);
			}
		}

		// Persist customer address data to account.
		$this->order_controller->sync_customer_data_with_order( $this->order );
	}
}