How To Display the Notification for Sucess or Failure using Paypal Payment with PDT in asp.net MVC

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I Got a notification "FAILED:Error 4020",Anybody help Me ,what is that Error and how will i solve this error and what
i did,First i passed username,password,apisignature values to "http://api-3t.sandbox.paypal.co/nvp"
and then i encrypted the values to paypal ,after paypal transaction it will return transactionID and how will i pass the TransactionID and TokenID for getting notification Success or failure and
I didn't able to get identity token from my developer account only available username,password and API signature

Posted 10-Apr-14 5:00am

VenkatesanKumar116

Updated 10-Apr-14 5:01am

v4

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gggustafson 10-Apr-14 14:57pm

You need to Google "PayPal FAILED:Error 4020" and review the results (many results). When you've educated yourself and still have a problem, come back here.

ZurdoDev 10-Apr-14 17:09pm

The paypal documentation will be the best place to reference the error codes. A quick google search looks like it is an authentication issue.

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Volynsky Alex · Accepted Answer · 2014-04-10T12:04:00

Solution 1

Two possible error messages for 4020: "Information received from an Invalid IP address" and just "Invalid IP address". So 4020 error genuinely is an IP restriction error and is not masquerading another error

Regards,
Alex

Posted 10-Apr-14 12:04pm

Volynsky Alex