function verify_nonce() { return wpcf7_verify_nonce($_POST['_wpnonce'], $_POST['_wpcf7_unit_tag']); }
function verify_nonce() { return wpcf7_verify_nonce($_POST['_wpnonce'], $this->id); }
private function verify_nonce() { return wpcf7_verify_nonce($_POST['_wpnonce'], $this->contact_form->id()); }