php - Inviting people with Trello API -

i'm trying invite person via email trello website. here api reference. when try invite him, plain reply "invalid key". here function:

public function inviteemployeetotrello ($email, $name, $isadmin) {     $organazationtrelloid = 'myorganazationid';     $trelloauthtoken = 'mytrelloauthtoken';     $trelloinviteurl = 'https://trello.com/1/organizations/'.$organazationtrelloid.'/members';      if ($isadmin == 1)     {         $type = 'admin';     }     else     {         $type = 'normal';     }      $fields = array(         'fullname' => $name,         'email' => $email,         'type' => $type,         'token' => $trelloauthtoken     );      // open connection     $ch = curl_init();      // set url, number of put vars, put data     curl_setopt($ch, curlopt_url, $trelloinviteurl);     curl_setopt($ch, curlopt_returntransfer, true);     curl_setopt($ch, curlopt_customrequest, "put");     curl_setopt($ch, curlopt_postfields, json_encode($fields));      // exec     $replyraw = curl_exec($ch);     $reply = json_decode($replyraw, true);      // close connection     curl_close($ch);      dd($ch); } 

curlopt_postfields not want json, if want urlencoded request, use http_build_query($fields) , or if want multipart/form-data request, give $fields array directly. (the api doc's doesn't seem mention request types accept, though. urlencoded common one.)