All code for Validating iOS In-App Purchases With Laravel blog post: http://blog.goforyt.com/validating-ios-app-purchases-laravel/

appleResponse.php

<?php

Array
(
    [status] => 0
    [environment] => Sandbox
    [receipt] => Array
        (
            [receipt_type] => ProductionSandbox
            [adam_id] => 0
            [app_item_id] => 0
            [bundle_id] => com.example.app
            [application_version] => 2.3.1
            [download_id] => 0
            [version_external_identifier] => 0
            [request_date] => 2014-11-21 07:06:39 Etc/GMT
            [request_date_ms] => 1416553599857
            [request_date_pst] => 2014-11-20 23:06:39 America/Los_Angeles
            [original_purchase_date] => 2013-08-01 07:00:00 Etc/GMT
            [original_purchase_date_ms] => 1375340400000
            [original_purchase_date_pst] => 2013-08-01 00:00:00 America/Los_Angeles
            [original_application_version] => 1.0
            [in_app] => Array
                (
                    [0] => Array
                        (
                            [quantity] => 1
                            [product_id] => com.example.app.product1
                            [transaction_id] => 1000000132544420
                            [original_transaction_id] => 1000000132544420
                            [purchase_date] => 2014-11-21 05:40:49 Etc/GMT
                            [purchase_date_ms] => 1416548449000
                            [purchase_date_pst] => 2014-11-20 21:40:49 America/Los_Angeles
                            [original_purchase_date] => 2014-11-21 05:40:45 Etc/GMT
                            [original_purchase_date_ms] => 1416548445000
                            [original_purchase_date_pst] => 2014-11-20 21:40:45 America/Los_Angeles
                            [is_trial_period] => false
                        )
                )
        )
)

buildReceipt.php

<?php

private function buildJSONReceiptObject($receipt, $password = NULL)
{
   $preObject['receipt-data'] = $receipt['appStoreReceipt'];

   if ($password)
   {
       $preObject['password'] = $password;
   }

   return json_encode($preObject);
}

inAppProducts.json

{
    "status": "success",
    "payload": {
        "products": [
            "com.example.product1",
            "com.example.product2"
        ]
    }
}

iOSPurchaseReceipt.json

{
    "receipt": {
        "type": "ios-appstore",
        "id": "1000000132544420",
        "appStoreReceipt": "base64 encoded data goes here",
        "transactionReceipt": "base64 encoded data goes here"
    }
}

makeRequest.php

<?php

private function makeRequest($user_id, $endpoint, $receiptObject)
{
   $options = [
       'http' => [
           'header'  => "Content-type: application/x-www-form-urlencoded",
           'method'  => 'POST',
           'content' => $receiptObject
       ],
   ];
   // see: http://php.net/manual/en/function.stream-context-create.php
   $context = stream_context_create($options);
   // see: http://php.net/manual/en/function.file-get-contents.php
   $result = file_get_contents($endpoint, FALSE, $context);

   if ($result === FALSE)
   {
       throw new ServerErrorException('Error validating transaction.', 560);
   }

   // Decode json object (TRUE variable decodes as an associative array)
   return json_decode($result, TRUE);
}

storeReceipt.php

<?php

$this->transactionRepo->addReceiptBeforeValidation(
		$user->id,
		$platform,
		$receipt['appStoreReceipt']
);

validateResponse.php

<?php

private function validateResponse($user_id, $decoded)
{
   if (!isset($decoded['status']))
   {
       throw new ServerErrorException('Error validating transaction.', 560);
   }
   elseif ($decoded['status'] != 0)
   {
       // throw error depending on the status code received
   }
}