sendinblue未连接到API

Question

I use the sendinblue API (Github Link) to send sms but I get this error:

[400] Error connecting to the API (https://api.sendinblue.com/v3/transactionalSMS/sms)

My relevant code:

/**
         * @Route("/send", name="cron.send.sms")
         */
        public function sendSms()
        {
            $listSms = $this->smsRespository->findSmsToSend();
            $config = Configuration::getDefaultConfiguration()
                ->setApiKey('api-key', $this->getParameter('SENDINBLUE_API_KEY'));

            $apiInstance = new TransactionalSMSApi(
                null,
                $config
            );
            $sendTransacSms = new SendTransacSms(['sender'=> 'med','recipient'=> '[phone]','content'=>'bonjour']);

           // print_r($sendTransacSms);
            try {
                dd($apiInstance->sendTransacSms($sendTransacSms));
                $result = $apiInstance->sendTransacSms($sendTransacSms);
                print_r($result);
            } catch (Exception $e) {
                echo 'Exception when calling ContactsApi->createContact: ', $e->getMessage(), PHP_EOL;
            }

        }

Can anyone assist?