In-App Purchase iap 内付费 二次验证代码。

客户端代码逻辑实现：

 // iapData 用户购成功的transactionReceipt
 -(BOOL)putStringToItunes:(NSData*)iapData
 {
     NSString*encodingStr = [iapData base64EncodedString];

     NSString *URL=@URL_VerifyReceipt;

     // https://sandbox.itunes.apple.com/verifyReceipt 测试地址
     // https://buy.itunes.apple.com/verifyReceipt 正式发布验证地址

     NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];// autorelease];
     [request setURL:[NSURL URLWithString:URL]];
     [request setHTTPMethod:@"POST"];
     //设置contentType
     [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
     //设置Content-Length
     [request setValue:[NSString stringWithFormat:@"%d", [encodingStr length]] forHTTPHeaderField:@"Content-Length"];

     NSDictionary* body = [NSDictionary dictionaryWithObjectsAndKeys:encodingStr, @"receipt-data", nil];
     SBJsonWriter *writer = [SBJsonWriter new];
     [request setHTTPBody:[[writer stringWithObject:body] dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]];
     NSHTTPURLResponse *urlResponse=nil;
     NSError *errorr=nil;
     NSData *receivedData = [NSURLConnection sendSynchronousRequest:request
                                                  returningResponse:&urlResponse
                                                              error:&errorr];

     //解析
     NSString *results=[[NSString alloc]initWithBytes:[receivedData bytes] length:[receivedData length] encoding:NSUTF8StringEncoding];

     printf(" \n MKStoreManager::putStringToItunes: %s \n", [results UTF8String]);

     NSDictionary*dic = [results JSONValue];
     if([[dic objectForKey:@"status"] intValue]==0) //注意，status=@"0" 是验证收据成功
     {
         return true;
     }
     return false;
 }

 // 交易成功
 -(void) provideContent: (SKPaymentTransaction *)transaction
 {
     if(delegate && [delegate respondsToSelector:@selector(productPurchasedSuccess:)])
     {
         if (!isNetworkOK()) {
             [delegate productPurchasedFailed:transaction.payment.productIdentifier];
             return;
         }
         if([self putStringToItunes:transaction.transactionReceipt])
         {
             printf("putStringToItunes check success!!! \n");
             [delegate productPurchasedSuccess:transaction.payment.productIdentifier];
         }else{
             [delegate productPurchasedFailed:transaction.payment.productIdentifier];

         }
     }
 }

如果验证逻辑放在服务器端。实现代码如下，
需要上传客户端得到的   NSString * encodingStr  =   [ iapData base64EncodedString ] ; 数据

 <?php
 /**
  * @说明：        iap 购买服务器验证逻辑
  * @作者：        [email protected]
  *
  * @data:         2013-05-06
  *
  * @备注：        客户端进行 iap 购买后，需要服务器再次进行验证。确定玩家是否购买成功
  *
  *
  */

 class BaseIapCheck
 {
     // 是否为沙盒测试环境
     const IapCheck_IsSandBox = true;


     /**
      * 得到 iap 购买的单据数据，如果成功购买了，返回正常的购买数据，否则返回 null
      * string $receipt, 客户端 iap 购买时，返回的单据数据, 此数据是在客户端经过 NSString*encodingStr = [iapData base64EncodedString]; 处理后的数据
      *
      * return ,验证成功，返回正常的购买数据，验证失败，返回 null
      *
      * 备注：可以通过 product_id 来判定具体购买的是哪一个收费道具
      */
     public static function GetReceiptData($receipt)
     {
         if (self::IapCheck_IsSandBox)
         {
             $url = 'https://sandbox.itunes.apple.com/verifyReceipt';
         }
         else
         {
             $url = 'https://buy.itunes.apple.com/verifyReceipt';
         }

         $postDataJson = json_encode(array('receipt-data' => $receipt));
         $opts = array
         (
                 'http' => array
                 (
                         'method' => 'POST',
                         'header'=> "Content-type: application/json" .                        // 必须设置为 application/json 格式
                         "Content-Length: " . strlen($postDataJson) . "\r\n",
                         'content' => $postDataJson
                 )
         );

         //生成请求的句柄文件
         $context = stream_context_create($opts);
         $html = file_get_contents($url, false, $context);
         $data = json_decode($html);

 //         echo ' ';
 //         echo '$html  ';
 //         var_dump($html);
 //         echo ' ';
 //         echo 'data  ';
 //         var_dump($data);
 //         echo ' ';

         //判断返回的数据是否是对象
         if (!is_object($data))
         {
             return null;
         }

         //判断是否购买成功
         if (!isset($data->status) || $data->status != 0)
         {
             return null;
         }

         //返回产品的信息
         return array(
                 'quantity' => $data->receipt->quantity,
                 'product_id' => $data->receipt->product_id,
                 'transaction_id' => $data->receipt->transaction_id,
                 'purchase_date' => $data->receipt->purchase_date,
                 'item_id' => $data->receipt->item_id,
                 'bid' => $data->receipt->bid,
                 'bvrs' => $data->receipt->bvrs
         );
     }
 }


 ?>