Getting null response on getAccessToken

Hi

Not sure why I am getting null, could you help me?

$code = $request->input('code');
$ccAuthorizationURL= $this->getAccessToken($code);
dump($ccAuthorizationURL);

curl resource @604 ▼  url: "https://idfed.constantcontact.com/as/token.oauth2?code=1wwtp21NvvvvTMAkCvh_lVgDJ&redirect_uri=http://localhost:8080/admin/constantcontact/rljccco ▶"
  content_type: null
  http_code: 0
  header_size: 0
  request_size: 0
  filetime: -1
  ssl_verify_result: 0
  redirect_count: 0
  total_time: 0.0
  namelookup_time: 0.0
  connect_time: 0.0
  pretransfer_time: 0.0
  size_upload: 0.0
  size_download: 0.0
  speed_download: 0.0
  speed_upload: 0.0
  download_content_length: -1.0
  upload_content_length: -1.0
  starttransfer_time: 0.0
  redirect_time: 0.0
  redirect_url: ""
  primary_ip: ""
  certinfo: []
  primary_port: 0
  local_ip: ""
  local_port: 0
  http_version: 0
  protocol: 0
  ssl_verifyresult: 0
  scheme: ""
  appconnect_time_us: 0
  connect_time_us: 0
  namelookup_time_us: 0
  pretransfer_time_us: 0
  redirect_time_us: 0
  starttransfer_time_us: 0
  total_time_us: 0
}