<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'http://35.154.208.8:8080/einvoice/v1.03/invoice/cancel',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
    "action": "CANCELIRN",
    "data": {
        "Irn": "81886c397764315d6417326fd08ec1aa25b5954409cdaee4d89a3e372e2ed3ed",
        "CnlRsn": "1",
        "CnlRem": "Wrong entry"
    }
}',
  CURLOPT_HTTPHEADER => array(
    'Content-Type: application/json',
    'gstin: 29AFQPB8708K000',
    'Accept: application/json',
    'action: CANCELIRN',
    'X-Connector-Auth-Token: l7xxba7aa16e968646b992298b377e955e7c:20180519134451:29AFQPB8708K000',
    'Authorization: Bearer d773d254-45da-491f-874f-a06495b3301a'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;
?>