PHP cURL Put, no permission (403 forbidden) - php

Question

I made a script that uses the Mobile.de API.
It worked fine on their test environment, only difference with the live environment is the proxy. So in my cURL I removed the proxy.
For any POST call this works just fine, but for my PUT call it doesn't work at all.
So let's say I sent the following with for example Postman:
PUT /seller-api/sellers/123/ads/456
Host: services.mobile.de
Content-Type: application/vnd.de.mobile.api+json
Authorization: Basic abcdef12345=
And I put in the right JSON, it works just fine.
And this is the script I use in PHP:
function updateVehicle($seller, $voertuig_id, $json) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://services.mobile.de/seller-api/sellers/' . $seller . '/ads/' . $voertuig_id);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_USERPWD, USERNAME . ':' . PASSWORD);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Host: services.mobile.de',
'Content-type: application/vnd.de.mobile.api+json'
));
$output = curl_exec($ch);
curl_close($ch);
return $output;
}
In return I get the 403 forbidden. 'You don't have permission to access /seller-api/sellers/123/ads/456 on this server.'
I already printed out al curl info and saw that all the headers are there and everything seems just fine, but why don't I have permission.
Contacted Mobile.de already but they say it's something in my code.

Answer 1

So after much debugging I found out it was a space after the $voertuig_id that got me an 403 forbidden error. :S