stripe api checking for existing card

Question

I\'m sure I\'m missing something obvious here, but I can\'t get my head around how to check for an existing card against a customer.

I\'m using the stripe connect ap

Answer 1

I created a function to do this:

• $customer is the stripe customer object
• $stripe_account is either your account's stripe ID or the connected account's stripe ID
• $token comes from stripe.js elements
• $check_exp allows you to decide if you want to check the card's expiration date as well, because the fingerprint does not change if the card's number is the same

• stripe PHP API 7.0.0

  function check_duplicate_card($customer, $stripe_account, $token, $check_exp) {
  $loc = "check_duplicate_card >> ";
  $debug = true;
  
  if ($debug) {
      // see here for an explanation for logging: http://php.net/set_error_handler >> Examples
      trigger_error("$loc started", E_USER_NOTICE);
  }
  
  try
  {
      // get token data
      $response = \Stripe\Token::retrieve(
          $token,
          ["stripe_account" => $stripe_account]
      );
      $token_fingerprint = $response->card->fingerprint;
      $token_exp_month = $response->card->exp_month;
      $token_exp_year = $response->card->exp_year;
      if ($debug) {
          trigger_error("$loc token_fingerprint = $token_fingerprint; token_exp_month = $token_exp_month; token_exp_year = $token_exp_year", E_USER_NOTICE);
      }
  
      // check for duplicate source
      if ($debug) {
          trigger_error("$loc customer sources = " . json_encode($customer->sources), E_USER_NOTICE);
      }
      $duplicate_found = false;
      foreach ($customer->sources->data as &$value) {
          // get data
          $fingerprint = $value->fingerprint;
          $exp_month = $value->exp_month;
          $exp_year = $value->exp_year;
  
          if ($fingerprint == $token_fingerprint) {
              if ($check_exp) {
                  if (($exp_month == $token_exp_month) && ($exp_year == $token_exp_year)) {
                      $duplicate_found = true;
                      break;
                  }
              } else {
                  $duplicate_found = true;
                  break;    
              }
          }
      }
      if ($debug) {
          trigger_error("$loc duplicate_found = " . json_encode($duplicate_found), E_USER_NOTICE);
      }
  } catch (Exception $e) {
      if ($e instanceof \Stripe\Exception\ApiErrorException) {
          $return_array = [
              "status" => $e->getHttpStatus(),
              "type" => $e->getError()->type,
              "code" => $e->getError()->code,
              "param" => $e->getError()->param,
              "message" => $e->getError()->message,
          ];
          $return_str = json_encode($return_array);
          trigger_error("$loc $return_str", E_USER_WARNING);
          http_response_code($e->getHttpStatus());
          echo $return_str;
      } else {
          $return_array = [
              "message" => $e->getMessage(),
          ];
          $return_str = json_encode($return_array);
          trigger_error("$loc $return_str", E_USER_ERROR);
          http_response_code(500); // Internal Server Error
          echo $return_str;
      }
  }
  
  if ($debug) {
      trigger_error("$loc ended", E_USER_NOTICE);
  }
  
  return $duplicate_found;
  }