Error Paypal REST API (sandbox) 404:"The requested URL /cgi-bin/ppapi was not found on this server." - paypal

Question

I'm using PHP curl and it is communicating with the server. I'm trying to get a token. I get the following unhelpful response from the paypal sandbox:
Not Found
The requested URL /cgi-bin/ppapi was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache Server at api.sandbox.paypal.com Port 443
I'm running the code (below) from localhost on my laptop.
/gettoken.php
<?php
//header('Content-Type:application/javascript');
$url = "https://api.sandbox.paypal.com/token";
$client_id = "xxx";
$secret = "xxx";
// Initiate curl
$ch = curl_init();
// set basic auth
curl_setopt($ch,CURLOPT_HTTPAUTH,CURLAUTH_BASIC);
// set user/password
curl_setopt($ch,CURLOPT_USERPWD,$client_id.":".$secret);
// set header accept
$headers = array('Accept:application/json','Accept-Language:en_US');
curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
// set mode to POST
curl_setopt($ch,CURLOPT_POST,1);
// add post fields (1)
$fields_string = "grant_type=client_credentials";
curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
// Disable SSL verification
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
// Will return the response, if false it print the response
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
// Set the url
curl_setopt($ch, CURLOPT_URL,$url);
// Execute
$result=curl_exec($ch);
if($result === false)
{
echo 'Curl error: ' . curl_error($ch);
}
// close curl
curl_close($ch);
// decode result
//var json = json_decode($result, true);
echo('<pre>'.$result.'</pre>');
?>

Answer 1

My apologies, the url to the REST service was wrong.. should have been:
https://api.sandbox.paypal.com/v1/oauth2/token
At least we know that if you get this error that it is likely the REST endpoint url is probably wrong.