Send offline events to Facebook API by using PHP curl

send_offline_events_to_facebook_api.php

<?php

// Replace with your access token
$access_token = 'your_access_token'; 

// PURCHASE DATA
// Replace with your own customer/purchase data
$data = array();
$data["match_keys"]["lead_id"] = "1234";
$data["event_time"] = 1477632399;
$data["event_name"] = "Purchase";
$data["currency"] = "USD";
$data["value"] = 2.00;

// Turn Data to JSON
$data_json = json_encode(array($data));

// Fill available fields
$fields = array();
$fields['access_token'] = $access_token;
$fields['upload_tag'] = "orders"; // You should set a tag here (feel free to adjust)
$fields['data'] = $data_json;

$ch = curl_init();
curl_setopt_array($ch, array(
  // Replace with your offline_event_set_id
  CURLOPT_URL => "https://graph.facebook.com/v2.10/your_offline_event_set_id/events", 
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS =>  http_build_query($fields),
  CURLOPT_HTTPHEADER => array(
    "cache-control: no-cache",
    "content-type: multipart/form-data",
    "Accept: application/json"  ),
));

$result = curl_exec($ch);

echo "\nResult encode";
echo ($result);

die();
if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}
curl_close ($ch);
?>