public function pay() {
    $curl = curl_init();
    curl_setopt_array($curl, array(
      CURLOPT_URL => 'https://core.paystar.ir/api/pardakht/create',
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => 'POST',
      CURLOPT_POSTFIELDS =>
       '{
         "amount": 150000,
         "order_id": "132456",
         "callback": "https://site.com/callback",
        }',
       CURLOPT_HTTPHEADER => array(
         'Authorization: Bearer m12OeFYin3jrycQl8P',
         'Content-Type: application/json'
	 ),
    ));
    $response = curl_exec($curl);
    curl_close($curl);
    return $response;
}