1. <response><error><code>4834</code><message>Invalid Ticket Id</message></error></response>

It looks like tickets were deprecated, so I'm not sure why I would be getting that. Here's the PHP code

2. $xml = '<Leads>';
3. $xml .= '<row no="1">';
4. $xml .= '<FL val="Lead Source">Source</FL>';
5. $xml .= '<FL val="First Name">'.htmlspecialchars($entry['first_name']).'</FL>';
6. $xml .= '<FL val="Last Name">'.htmlspecialchars($entry['last_name']).'</FL>';
7. $xml .= '<FL val="Email">'.htmlspecialchars($entry['email']).'</FL>';
8. $xml .= '</row>';
9. $xml .= '</Leads>';
10. 
    
11. $url = "https://crm.zoho.com/crm/private/xml/Leads/insertRecords";
12. $query = "newFormat=1&authtoken=".$this->zoho_auth_token."&scope=crmapi&xmlData=".urlencode($xml);
13. $ch = curl_init();
14. curl_setopt($ch, CURLOPT_URL, $url);
15. curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
16. curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
17. curl_setopt($ch, CURLOPT_TIMEOUT, 30);
18. curl_setopt($ch, CURLOPT_POST, 1);
19. curl_setopt($ch, CURLOPT_POSTFIELDS, $query);
20. curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
21. curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
22. 
    
23. $response = curl_exec($ch);
24. curl_close($ch);
25. var_dump($response);