Sipcentric API originate call example in PHP5

gistfile1.php

<?php

    $username = "username"; // Sipcentric API username
    $password = "password"; // Sipcentric API password

    $customer = "me"; // Enter your customer number here
    $dial = "0123456789"; // Enter a number to dial

    // Change number at the end to the one of your extension (this one is my extension 002535)
    $extension = "https://pbx.sipcentric.com/api/v1/customers/" . $customer . "/endpoints/2535";

    // Everything below is fine to leave...

    $data = array(
        "type" => "call",
        "endpoint" => $extension,
        "to" => $dial
    );

    $json = json_encode($data);

    echo "Calling " . $dial . " from " . $extension;

    $request = curl_init("https://pbx.sipcentric.com/api/v1/customers/" . $customer . "/calls");

    curl_setopt($request, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($request, CURLOPT_USERPWD, $username . ":" . $password);
    curl_setopt($request, CURLOPT_POSTFIELDS, $json);
    curl_setopt($request, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($request, CURLOPT_HTTPHEADER, array(
        "Content-Type: application/json",
        "Content-Length: " . strlen($json))
    );

    $result = curl_exec($request);

?>