我验证了这样的收据：
NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];
NSData *receipt = [NSData dataWithContentsOfURL:receiptURL];
/* send data to apple to verify */
我按预期得到了json的回应。奇怪的是我今天（6月5日）订阅了，但是在json dict中，我得到的最新记录是5月7日，就像这样：
{
"expires_date" = "2015-05-07 15:25:33 Etc/GMT";
"expires_date_ms" = 1431012333000;
"expires_date_pst" = "2015-05-07 08:25:33 America/Los_Angeles";
"is_trial_period" = false;
"original_purchase_date" = "2015-05-07 14:13:35 Etc/GMT";
"original_purchase_date_ms" = 1431008015000;
"original_purchase_date_pst" = "2015-05-07 07:13:35 America/Los_Angeles";
"original_transaction_id" = 1000000152987263;
"product_id" = "com.xxxxx.xxxxxx";
"purchase_date" = "2015-05-07 14:25:33 Etc/GMT";
"purchase_date_ms" = 1431008733000;
"purchase_date_pst" = "2015-05-07 07:25:33 America/Los_Angeles";
quantity = 1;
"transaction_id" = 1000000154409972;
"web_order_line_item_id" = 1000000029706408;
}
知道发生了什么事吗？我希望从这次验证中获得最新的到期日期，这应该是一段时间。这是正确的方法吗？