wc-add-refund-request-links.php

<?php // only copy if needed

/**
 * Adds a "Request Refund" action to the account for paid orders
 * REQUIRES WooCommerce 2.5+
 *
 * @param array $actions the account actions for the order
 * @param \WC_Order $order
 * @return array updated actions
 */
function sww_add_account_refund_order_action( $actions, $order ) {

	if ( $order->is_paid() ) {

		$actions['refund_request'] = array(
			'url'  => sww_get_order_refund_request_url( $order ),
			'name' => __( 'Request Refund', 'my-textdomain' ),
		);
	}

	return $actions;
}
add_filter( 'woocommerce_my_account_my_orders_actions', 'sww_add_account_refund_order_action', 10, 2 );


/**
 * Add a "Request Refund" link to order emails if the order is paid for
 * REQUIRES WooCommerce 2.5+
 *
 * @param \WC_Order $order
 */
function sww_add_refund_request_email_link( $order ) {

	if ( $order->is_paid() ) {
		echo '<br /><a class="link" href="' . esc_url( sww_get_order_refund_request_url( $order ) ) . '">Request Refund</a>';
	}
}
add_action( 'woocommerce_email_after_order_table', 'sww_add_refund_request_email_link', 15, 1 );


if ( ! function_exists( 'sww_get_order_refund_request_url' ) ) :

/**
 * Helper function to generate a URL that will add an order number and product list to a refund form
 * 
 * @param \WC_Order $order
 * @return string the refund form URL
 */
function sww_get_order_refund_request_url( $order ) {

	// enter the ID for your page that contains the refund request form
	$page_id = 196;

	// now we'll build the right refund URL from it
	$refund_url = trailingslashit( get_page_link( $page_id ) ) . '?order=' . $order->get_order_number();
	$products   = array();

	foreach ( $order->get_items() as $item_id => $item ) {
		if ( $product = wc_get_product( $item['product_id'] ) ) {
			$products[] = $product->get_title();
		}
	}

	if ( ! empty( $products ) ) {
		$refund_url .= '&products=' . urlencode( implode( ', ', $products ) );
	}

	return $refund_url;
}

endif;

hi where have you added page id