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：        [e-mail]
 *
 * @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 = '';
        }
        else
        {
            $url = '';
        }

        $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
        );
    }
}


?>