<?php
  
  $curl = curl_init();
  
  curl_setopt_array($curl, array(
    CURLOPT_URL => "https://<your_app_subdomain>.user.com/api/public/tickets/:id/",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => "",
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => "DELETE",
    CURLOPT_HTTPHEADER => array(
      "Accept: */*; version=2",
      "authorization: Token <your_64_char_api_key>"
    ),
  ));
  
  $response = curl_exec($curl);
  $err = curl_error($curl);
  
  curl_close($curl);
  
  if ($err) {
    echo "cURL Error #:" . $err;
  } else {
    echo $response;
  }