<?php
  $whmcsUrl = "https://test.etravelsmart.com/etsAPI/api/getStations?";
  // Admin username and password
  $username = "888888888";
  $password = "**********";
 // Set post values
  $postfields = array(
'username' => $username,
'password' => md5($password),
'action' => 'GetClients',
'responsetype' => 'json',
 );
$arrContextOptions=array(
"ssl"=>array(
    "verify_peer"=>false,
    "verify_peer_name"=>false,
),
);

  // Call the API
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $whmcsUrl);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postfields));
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
$response = curl_exec($ch);
if (curl_error($ch)) {
die('Unable to connect: ' . curl_errno($ch) . ' - ' . curl_error($ch));
 }
curl_close($ch);
// Attempt to decode response as json
$jsonData = json_decode($response, true);
 // Dump array structure for inspection
  var_dump($jsonData);

   ?>

{"stationList":[{"stationName":"10   dol","stationId":-1},{"stationName":"Chennai","stationId":2666}],"apiStatus":{"success":true,"message":"SUCCESS"}}