woocommerce_shipping_settings filter-hook . WC 1.0

$settings = apply_filters(
	'woocommerce_shipping_settings',
	array(
		array(
			'title' => __( 'Shipping options', 'woocommerce' ),
			'type'  => 'title',
			'id'    => 'shipping_options',
		),

		array(
			'title'         => __( 'Calculations', 'woocommerce' ),
			'desc'          => __( 'Enable the shipping calculator on the cart page', 'woocommerce' ),
			'id'            => 'woocommerce_enable_shipping_calc',
			'default'       => 'yes',
			'type'          => 'checkbox',
			'checkboxgroup' => 'start',
			'autoload'      => false,
		),

		array(
			'desc'          => __( 'Hide shipping costs until an address is entered', 'woocommerce' ),
			'id'            => 'woocommerce_shipping_cost_requires_address',
			'default'       => 'no',
			'type'          => 'checkbox',
			'checkboxgroup' => 'end',
		),

		array(
			'title'           => __( 'Shipping destination', 'woocommerce' ),
			'desc'            => __( 'This controls which shipping address is used by default.', 'woocommerce' ),
			'id'              => 'woocommerce_ship_to_destination',
			'default'         => 'billing',
			'type'            => 'radio',
			'options'         => array(
				'shipping'     => __( 'Default to customer shipping address', 'woocommerce' ),
				'billing'      => __( 'Default to customer billing address', 'woocommerce' ),
				'billing_only' => __( 'Force shipping to the customer billing address', 'woocommerce' ),
			),
			'autoload'        => false,
			'desc_tip'        => true,
			'show_if_checked' => 'option',
		),

		array(
			'title'    => __( 'Debug mode', 'woocommerce' ),
			'desc'     => __( 'Enable debug mode', 'woocommerce' ),
			'desc_tip' => __( 'Enable shipping debug mode to show matching shipping zones and to bypass shipping rate cache.', 'woocommerce' ),
			'id'       => 'woocommerce_shipping_debug_mode',
			'default'  => 'no',
			'type'     => 'checkbox',
		),

		array(
			'type' => 'sectionend',
			'id'   => 'shipping_options',
		),

	)
);