Zoho API-V2 Add Attactmetn URL - php

Question

I am trying to add attachment url in crm. I am flowing this documentation . But i got error !
This is my code :
$zoho_url = "https://www.zohoapis.com/crm/v2/$module/$id/Attachments";
$post['attachmentUrl'] = $url;
$ch=curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch,CURLOPT_URL,$zoho_url);
curl_setopt($ch,CURLOPT_POSTFIELDS,$post);
$headers = array();
$headers[] = "Authorization: ".$authtoken;
$headers[] = "Content-Type: multipart/form-data";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$response = curl_exec($ch);
$err = curl_errno($ch);
curl_close ($ch);
if ($err) {
$result = $err;
} else {
$result = $response;
}
print_r($result);
This is response :
{"code":"INVALID_REQUEST","details":{},"message":"unable to process your request. please verify whether you have entered proper method name, parameter and parameter values.","status":"error"}

Answer 1

I made this code for attach a file in a zoho record.
//Get the oauth Token
$accessToken=getCurrentAccessToken();
// files to upload
$tmpfile;
$filename;
$type;
foreach($files as $file){
$tmpfile = $file['tmp_name'];
$filename = basename($file['name']);
$type = $file['type'];
}
$cfile = new CURLFile(realpath($tmpfile),$type,$filename);
$post_data = array (
'file' => $cfile
);
$url = "https://www.zohoapis.com/crm/v2/$module/$id/Attachments";
$headers = array(
'Content-Type: multipart/form-data',
sprintf('Authorization: Zoho-oauthtoken %s', $accessToken)
);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
$response = curl_exec($ch);
return $response;