[PHP] Updating Access Token

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PHP Update Access Token Request
$endpoint = "https://api.channeladvisor.com/oauth2/token";
$application_id= "{{APPLICATION_ID}}";
$url = $endpoint;
$client_id = base64_encode("$application_id:$shared_secret");
$body = "grant_type=refresh_token&refresh_token=$refresh_token";
$length = strlen($body);
$headers = array(
    "Authorization: Basic $client_id",
    "Content-Type: text/plain",
    "Cache-Control: no-cache",
    "Content-Length: $length"
echo "URL:".$url."\n";
echo "Body:$body\n";
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
curl_setopt($curl, CURLOPT_POSTFIELDS, $body);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$result = curl_exec($curl);
$httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
$json = json_decode($result, true);