Fatal error: Uncaught RuntimeException: Gateway request failed safely. in C:\xampp\htdocs\smsgateway2\examples\php\SmsGatewayClient.php:82 Stack trace: #0 C:\xampp\htdocs\smsgateway2\examples\php\SmsGatewayClient.php(38): SmsGatewayClient->request('PUT', '/api/v1/webhook', Array, NULL, NULL) #1 C:\xampp\htdocs\smsgateway2\examples\php\configure_webhook.php(6): SmsGatewayClient->configureWebhook(Array) #2 {main} thrown in C:\xampp\htdocs\smsgateway2\examples\php\SmsGatewayClient.php on line 82