View source  
  <?php
namespace Drupal\commerce_stripe;
use Drupal\commerce_payment\Exception\AuthenticationException;
use Drupal\commerce_payment\Exception\DeclineException;
use Drupal\commerce_payment\Exception\HardDeclineException;
use Drupal\commerce_payment\Exception\InvalidRequestException;
use Drupal\commerce_payment\Exception\InvalidResponseException;
use Stripe\Exception\ApiConnectionException;
use Stripe\Exception\ApiErrorException;
use Stripe\Exception\AuthenticationException as StripeAuthenticationException;
use Stripe\Exception\CardException;
use Stripe\Exception\InvalidRequestException as StripeInvalidRequestException;
use Stripe\Exception\RateLimitException;
class ErrorHelper {
  
  public static function handleException(ApiErrorException $exception) {
    if ($exception instanceof CardException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      if ($exception
        ->getStripeCode() == 'card_declined' && $exception
        ->getDeclineCode() == 'card_not_supported') {
        
        $message = t('Your card is not supported. Please use a Visa, MasterCard, or American Express card.');
        \Drupal::messenger()
          ->addWarning($message);
        throw new HardDeclineException($message);
      }
      else {
        throw new DeclineException('We encountered an error processing your card details. Please verify your details and try again.');
      }
    }
    elseif ($exception instanceof RateLimitException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      throw new InvalidRequestException('Too many requests.');
    }
    elseif ($exception instanceof StripeInvalidRequestException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      throw new InvalidRequestException('Invalid parameters were supplied to Stripe\'s API.');
    }
    elseif ($exception instanceof StripeAuthenticationException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      throw new AuthenticationException('Stripe authentication failed.');
    }
    elseif ($exception instanceof ApiConnectionException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      throw new InvalidResponseException('Network communication with Stripe failed.');
    }
    elseif ($exception instanceof ApiErrorException) {
      \Drupal::logger('commerce_stripe')
        ->warning($exception
        ->getMessage());
      throw new InvalidResponseException('There was an error with Stripe request.');
    }
    else {
      throw new InvalidResponseException($exception
        ->getMessage());
    }
  }
  
  public static function handleErrors($result) {
    $result_data = $result
      ->toArray();
    if ($result_data['status'] == 'succeeded') {
      return;
    }
    if (!empty($result_data['failure_code'])) {
      $failure_code = $result_data['failure_code'];
      
      $hard_decline_codes = [
        'processing_error',
        'missing',
        'card_declined',
      ];
      if (in_array($failure_code, $hard_decline_codes)) {
        throw new HardDeclineException($result_data['failure_message'], $failure_code);
      }
      else {
        throw new InvalidRequestException($result_data['failure_message'], $failure_code);
      }
    }
  }
}