Paypal pdt paypal PDT缺少变量

我对PDT有意见

付款后，当页面从paypal返回给商户时，我使用pdt令牌请求获取交易信息

通常情况下，我从paypal获得这些参数，如果是定期销售：

                [transaction_subject] => paypal product
                [payment_date] => 19:53:02 Jul 12, 2018 PDT
                [txn_type] => subscr_payment
                [subscr_id] => I-XXXXXX
                [last_name] => test
                [residence_country] => CO
                [item_name] => paypal product
                [payment_gross] => 25.00
                [mc_currency] => USD
                [business] => vendor_email
                [payment_type] => instant
                [protection_eligibility] => Ineligible
                [payer_status] => unverified
                [payer_email] => buyer_email
                [txn_id] => XXXXXXXXXXX
                [receiver_email] => vendor_email
                [first_name] => test
                [payer_id] => XXXXXXXX
                [receiver_id] => XXXXXXXX
                [contact_phone] => 55555555
                [item_number] => 1234
                [payment_status] => Completed
                [payment_fee] => 1.64
                [mc_fee] => 1.64
                [mc_gross] => 25.00
                [custom] => 4321
                [charset] => windows-1252
                [] => 

但在一些交易中，paypal的回复缺少以下4项：

subscr\u id 项目名称 项目编号 习俗

知道他们为什么失踪吗？购买是一样的，唯一不同的是买家

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谢谢

最后，paypal的人说这是他们这边的一个bug。他们正试图在不可预见的未来解决这一问题：）