取得iAP的receipt

//取得iAP的receipt

+(NSData *) getReceiptData:(SKPaymentTransaction *)transaction{

    NSData *receiptData = nil;

    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {

        receiptData = transaction.transactionReceipt;

    }

    else {

        NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[[NSBundle mainBundle] appStoreReceiptURL]];

        NSError *error = nil;

        receiptData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:nil error:&error];

    }

    return receiptData;

}