curl_request.php

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_PORT => "9443",
  CURLOPT_URL => "https://localhost:9443/oauth2/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "grant_type=password&username=admin&password=admin&scope=admin&=",
  CURLOPT_HTTPHEADER => array(
    "authorization: Basic MmJxbHM0U3lESjRjOHlDOE5ub2pFRHlVZmdVYTpoNHdKSmlIVWZ3OHNIWlRwTXU2dzZIaHppRGNh",
    "cache-control: no-cache",
    "content-type: application/x-www-form-urlencoded",
    "postman-token: add7c24e-737e-b9cf-1c07-d5c114949479"
  ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}