Set woocommerce coupon to be available only for logged in users

wc-coupon-loggedin-only.php

<?php

add_filter( 'woocommerce_coupon_is_valid', function( $is_valid, $coupon ) {

    /**
     * Selected coupons allowed for logged in users only
     */
    if ( in_array( $coupon->get_code() , ['loggedinonly', 'anothercoupontitle']) && ! is_user_logged_in() )
    {
        return false;
    }
  
    return $is_valid;
}, 100, 2 );

add_filter('woocommerce_coupon_error', function ($message, $error_code, $coupon) {
    if (in_array($coupon->get_code(), ['loggedinonly'])) {
        $message = '<div>Coupon is valid for registered users only. <a href="' . home_url('/register') . '">Register now!</a></div>';
    }

    return $message;
}, 10, 3);