You can add &client_id= followed by your client id to the end of the request URL and it should now work (at least the API request anyway, I’m not a PHP guy so can’t vouch for the rest of the code 
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You can add &client_id= followed by your client id to the end of the request URL and it should now work (at least the API request anyway, I’m not a PHP guy so can’t vouch for the rest of the code )