PHP Example throwing 401 Error

[arumals]

I was able to make the examples run in Node and Go (after fixing some issues in the code), but not the PHP.

I keep getting this error.

Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: `POST https://api.sumsub.com/resources/applicants?levelName=basic-kyc-level` resulted in a `401 Unauthorized` response:
{
  "code" : 401,
  "correlationId" : "dcd65973ceb873bd53df030975fc557b",
  "errorCode" : 4000,
  "errorName" : "app-tok (truncated...)
 in /Users/arturomaltos/Projects/POCs/sumsub/Php/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113