woocommerce-nvi-tc-kimlik-dogrulama

functions.php

<?php

function strto($to, $str) {
    if ('lower' === $to) {
      return mb_strtolower(str_replace(array('I', 'Ğ', 'Ü', 'Ş', 'İ', 'Ö', 'Ç'), array('ı', 'ğ', 'ü', 'ş', 'i', 'ö', 'ç'), $str), 'utf-8');
      } elseif ('upper' === $to) {
          return mb_strtoupper(str_replace(array('ı', 'ğ', 'ü', 'ş', 'i', 'ö', 'ç'), array('I', 'Ğ', 'Ü', 'Ş', 'İ', 'Ö', 'Ç'), $str), 'utf-8');
      } else {
          trigger_error('Lütfen geçerli bir strto() parametresi giriniz.', E_USER_ERROR);
      }
}

add_action('woocommerce_after_checkout_validation', 'kk_nvi_sorgulama', 20, 2);
function kk_nvi_sorgulama( $data, $errors ) {
    if (! empty($_POST['billing_wooccm9']) && ! empty($_POST['billing_wooccm10']) && ! empty($data['billing_first_name']) && ! empty($data['billing_last_name'])) {
      $client = new SoapClient("https://tckimlik.nvi.gov.tr/Service/KPSPublic.asmx?WSDL");
      try{
      $requestData = array(
        "TCKimlikNo" => $_POST['billing_wooccm9'],
        "Ad"         => strto('upper', $data['billing_first_name']),
        "Soyad"      => strto('upper', $data['billing_last_name']),
        "DogumYili"  => $_POST['billing_wooccm10']
      );
      $result = $client->TCKimlikNoDogrula($requestData);
      if ( ! $result->TCKimlikNoDogrulaResult){
        $errors->add( 'validation', 'NVI Hata, T.C. Kimlik numaranız doğrulanamadı !' );
      }
    }
    catch (Exception $ex){
      echo $ex->faultstring;
    }
  }
}

Code goes to child theme functions.php, billing_wooccm9 & billing_wooccm10 are custom fields for nvi validation.