Как интегрировать Teamleader в PHP

<?php
 
// $url will contain the API endpoint
$url = "https://app.teamleader.eu/api/helloWorld.php";
 
// $fields contains all the fields that will be POSTed
$fields = array(  
    "api_group"=>("YOUR_API_GROUP"),
    "api_secret"=>("YOUR_API_SECRET")
);
 
// Make the POST request using Curl
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, true);   
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
 
// Decode and display the output
$api_output =  curl_exec($ch);
$json_output = json_decode($api_output);
$output = $json_output?$json_output:$api_output;
 
// Clean up
curl_close($ch);
 
?>

<?php
 
if (isset($_POST['contact'])) 
{
 
// Put contacting email here
$main_email = "contact@mail.ru";
 
 
//Fetching Values from URL
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$subject1 = $_POST['subject'];
 
 
//Sanitizing email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);
 
 
//After sanitization Validation is performed
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    
    
        $subject = "Message from contact form";
        
        // To send HTML mail, the Content-type header must be set
        $headers = 'MIME-Version: 1.0' . "\r\n";
        $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
        $headers .= 'From:' . $email. "\r\n"; // Sender's Email
        $headers .= 'Cc:' . $email. "\r\n"; // Carbon copy to Sender
        
        $template = '<div">Hello ' . $name . ',<br/>'
        . 'Thank you for contacting us.<br/><br/>'
        . '<strong>Name:</strong>  ' . $name . '<br/>'
        . '<strong">Email:</strong>  ' . $email . '<br/>'
        . '<strong">Subject:</strong>  ' . $subject1 . '<br/><br/>'
        . '<strong">Message:</strong>  ' . $message . '<br/><br/>'
        . 'This is a Contact Confirmation mail.'
        . '<br/>'
        . 'We will contact you as soon as possible .</div>';
        $sendmessage = "<div>" . $template . "</div>";
        
        // message lines should not exceed 70 characters (PHP rule), so wrap it
        $sendmessage = wordwrap($sendmessage, 70);
        
        // Send mail by PHP Mail Function
        mail($main_email, $subject, $sendmessage, $headers);
        echo "";
    
    
} else {
    echo "<span class='contact_error'>* Invalid email *</span>";
}
    }
 
?>

$fields = array(  
    "api_group"=>("276453"),
    "api_secret"=>("К2р4lmGert56Z")
);