iOS Swift4中PayTM校验和不匹配

Question

当我通过api调用生成校验和并在Web视图中的以下参数中传递此校验和时，我正在将Paytm网关集成到ios应用程序中

WEB VIEW正在使用Parms加载：

{

   "CALLBACK_URL" = "https://securegw-stage.paytm.in/theia/paytmCallback?ORDER_ID=SJ-1552029210215";

  "CHANNEL_ID" = WAP;
  CHECKSUMHASH = "FRMuR8LLFvg3wkIf6gp4BqVnNigr6WvUaSm9EVJIJo6Z5RicUvU7acRGZlEfK1FGoeNSqN53R0OphttHFnJuZ0lKeAZDvrG7Pr5ZnlzTEUw=";
  "CUST_ID" = 64;

   EMAIL = "jitu123@gmail.com";

  "INDUSTRY_TYPE_ID" = Retail;

    MID = rxazcv89315285244163;
   "MOBILE_NO" = 566789877;
   "ORDER_ID" = "SJ-1552029210215";
   "TXN_AMOUNT" = "246.0";
   WEBSITE = WEBSTAGING;
}

我又回到了回应之下

{
   "ORDERID" : "SJ-1552029210215",
   "MID" : "rxazcv89315285244163",
   "TXNAMOUNT" : "246.00",
   "BANKTXNID" : "",
   "RESPCODE" : "330",
   "STATUS" : "TXN_FAILURE",
   "CURRENCY" : "INR",
   "RESPMSG" : "Paytm checksum mismatch."
}

我该如何解决Paytm校验和不匹配的问题？