"message": "Sandbox subdomains are for test purposes only. Please add your own domain or add the address to authoriz LARAVEL

i got this error when i try to test method in my controller

 GuzzleHttp\Exception\ClientException: Client error: `POST http://ift.tt/2sWwkqv` resulted in a `400 BAD REQUEST` response:
{
  "message": "Sandbox subdomains are for test purposes only. Please add your own domain or add the address to authoriz (truncated...)

via Chebli Mohamed