return error code : 401, No license found for the given deviceId - authentication

Question

i have use this api
curl -X POST
https://tracking.api.here.com/v2/token
-H 'Authorization: Bearer {signedRequest}'
my php code is
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://tracking.api.here.com/v2/timestamp');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
$result = json_decode($result);
curl_close($ch);
$timestamp = ($result->timestamp);
$accessKey = $deviceId;
$secret = $deviceSecret;
$url = "https://account.api.here.com/oauth2/token";
$nonce = mt_rand(100000,999999);
$timestamp = $timestamp;
$baseString = "grant_type=client_credentials&oauth_consumer_key=".$accessKey."&oauth_nonce=".$nonce."&oauth_signature_method=HMAC-SHA256&oauth_timestamp=".$timestamp."&oauth_version=1.0";
$workingString = array();
foreach (explode('&', $baseString) as $parameter) {
$parameter = explode('=', $parameter);
$workingString[] = urlencode($parameter[0]).'='.trim(urlencode($parameter[1]));
}
$urlEncodeParamaterString = implode('&', $workingString);
$fullBaseString = "POST&".urlencode($url)."&".urlencode($urlEncodeParamaterString);
$hashKey = $secret.'&';
function encode($data) {
return str_replace(['+', '/'], ['-', '_'], base64_encode($data));
}
function decode($data) {
return base64_decode(str_replace(['-', '_'], ['+', '/'], $data));
}
$binaryKey = decode($hashKey);
$signature = encode(hash_hmac("sha256", $fullBaseString, $binaryKey, true));
$authHeader = "OAuth oauth_consumer_key=".$accessKey.",oauth_signature_method='HMAC-SHA256',oauth_timestamp='".$timestamp."',oauth_nonce=".$nonce.",oauth_version='1.0',oauth_signature=".$signature."";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://tracking.api.here.com/v2/token');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
$headers = array();
$headers[] = 'Content-Type: application/x-www-form-urlencoded';
$headers[] = 'Authorization: '.$authHeader;
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close($ch);
echo '';
print_r($result);
output
{
code: 401,
id: "312f56e5-db4f-40f5-807f-c5a0413dd668",
message: "No license found for the given deviceId.",
error: "Timestamp wrong When the request timestamp has a more than 10 second difference from the server time, the x-here-timestamp header with the current server timestamp is added to the response. Incorrect Signature If the OAuth signature is incorrect, the response will be a 401 but without the x-here-timestamp field. "
}

Answer 1

In order to tracking a Device using HERE Tracking Service all you'll need to login and Create your Device ID First.
Please see below getting start documentation.
https://developer.here.com/documentation/tracking/dev_guide/topics/getting-started-1-creating-a-device-licence.html