<?php
    $client_pass = '***';
    $data['action'] = 'SALE';
    $data['client_key'] = '***';
    $data['order_id'] = '546-4588';
    $data['order_amount'] = '1000.00';
    $data['order_currency'] = 'UAH';
    $data['order_description'] = 'test';
    $data['card_number'] = '4111111111111111';
    $data['card_cvv2'] = '159';
    $data['card_exp_month'] = '01';
    $data['card_exp_year'] = '2022';
    $data['payer_first_name'] = 'Ivan';
    $data['payer_last_name'] = 'Ivanov';
    $data['payer_phone'] = '380111111111';
    $data['payer_address'] = 'NA';
    $data['payer_country'] = 'UA';
    $data['payer_state'] = 'NA';
    $data['payer_city'] = 'Kiev';
    $data['payer_zip'] = '01001';
    $data['payer_email'] = 'sale@gmail.com';
    $data['payer_ip'] = '213.186.115.164';
    $data['req_token'] = 'Y';
    $data['recurring_init'] = 'N';
    $data['term_url_3ds'] = 'https://google.com';
    $data['hash'] = md5(
                     strtoupper(   strtoupper(
           strrev(                 strrev($data['payer_email']).
                    ($client_pass).        $client_pass.
         strrev(                   strrev(substr($data['card_number'],0,6).
                  substr($data['card_number'],-4))
                 )       )
       )             );

$url = 'https://secure.platononline.com/post-unq/';
 
$crq = curl_init();
   
curl_setopt($crq, CURLOPT_URL, $url);
  
 curl_setopt($crq, CURLOPT_HEADER, 0);
   
curl_setopt($crq, CURLOPT_POST, 1);

   curl_setopt($crq, CURLOPT_RETURNTRANSFER, 1);
  
 curl_setopt($crq, CURLOPT_SSL_VERIFYHOST, 0);
   
curl_setopt($crq, CURLOPT_SSL_VERIFYPEER, 0);

   curl_setopt($crq, CURLOPT_POSTFIELDS, http_build_query($data));
 
$result = curl_exec($crq);

 if (curl_errno($crq)) {
    echo 'ERROR: '.curl_error($crq);
  }else{
    echo $result;
  }
 
curl_close($crq);