我试图整合JazzCash网关V2，并希望作出直接支付交易，这是由文档定义为“这是一个单一的交易，授权付款和转移资金从付款人的帐户到商家的帐户。”
下面是我的哈希函数

function get_SecureHash($data_array) {
    ksort($data_array);
    $str = '';
    foreach($data_array as $key => $value) {
        if(!empty($value)) {
            $str = $str . '&' . $value;
        }
    }
    $str = $saltkey.$str;
    $pp_SecureHash = hash_hmac('sha256', $str, $saltkey);
    return $pp_SecureHash;
}

我已经匹配了我的哈希，它与文档推荐的HashCalculator计算的哈希相同。https://github.com/aliabidzaidi/HashCalculator
我使用以下URL：

$post_url = "https://sandbox.jazzcash.com.pk/ApplicationAPI/API/Purchase/PAY";

我的数组看起来如下：

$data_array = array(
   "pp_IsRegisteredCustomer"=> "yes",
   "pp_ShouldTokenizeCardNumber"=> "yes",
   "pp_CustomerID"=> "25352",
   "pp_CustomerEmail"=> "abc@abc.com",
   "pp_CustomerMobile"=> "03331234567",
   "pp_Version"=> "2.0",
   "pp_TxnType"=> "MPAY",
   "pp_TxnRefNo"=> "T".date('YmdHisu'),
   "pp_MerchantID"=> "MYMERCHANTID",
   "pp_Password"=> "MYPASSWORD",
   "pp_Amount"=> "20000",
   "pp_TxnCurrency"=> "PKR",
   "pp_TxnDateTime"=> date('YmdHis'),
   "pp_TxnExpiryDateTime"=> date('YmdHis',strtotime("+1 hours")),
   "pp_BillReference"=> "billRef",
   "pp_Description"=> "Description of transaction",
   "pp_CustomerCardNumber"=> "512345000000008",
   "pp_CustomerCardCVV"=> "100",
   "pp_CustomerCardExpiry"=> "01/39",
   "pp_SecureHash"=> "",
   "pp_DiscountedAmount"=> "",
   "pp_DiscountBank"=> "",
   "pp_UsageMode"=> "API"
);

当我运行curl时，我得到以下输出：

{"responseCode":"110","responseMessage":"Please provide a valid value for pp_ Txn Ref No.","status":null,"pp_RetreivalReferenceNo":null,"secureHash":"9DE9F8E571F29CBD1316DFB2F0388E3FBE1CA9BC26FB9C284DF900DCCBA0C301"}

接下来我可以尝试什么？