add_action( 'wp_head', 'resource_registered', 30, 2 );
function resource_registered( $entry_id, $form_id ) {
        $cookie_value = 'abc' // some logic here to set the value of the cookie
        setcookie( 'user_status', $cookie_value, time() + 31556926, '/' );
        }
}

https://www.wpbeginner.com/wp-tutorials/how-to-set-get-and-delete-wordpress-cookies-like-a-pro/

function resource_registered($entry_id, $form_id) {
    $value = true;
    setcookie('returning_user', $value, time() + 31556926, '/');
}

if (isset($_COOKIE['returning_user']) && $_COOKIE['returning_user'] == true) {
    // do stuff if cookie is set
}