HttpWebRequest to send POST data with paypal parameters?

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Hi,
When I send a request to the paypal using following code lines for authentication,

C#

HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create("https://api-3t.sandbox.paypal.com/nvp");
StringBuilder URLQueryString = new StringBuilder();
URLQueryString.Append("USER=bilal._1303994161_biz_api1.muskysoftware.com&");
URLQueryString.Append("PWD=somepassword&");
URLQueryString.Append("SIGNATURE=A3s7K7bICpflbySN2Fd3AlzTTbF1AZLBiCeUdtRindoV3BOytl-BKSsv&");
URLQueryString.Append("SUBJECT=Hello this a test&");
URLQueryString.Append("VERSION=56.0");
objRequest.Method = "POST";
objRequest.ContentLength = URLQueryString.Length;
objRequest.ContentType = "application/x-www-form-urlencoded";

I get the following response:

ACK=Failure&L_ERRORCODE0=81002&L_SHORTMESSAGE0=Unspecified%20Method&L_LONGMESSAGE0=Method<br />
%20Specified%20is%20not%20Supported&L_SEVERITYCODE0=Error<br />

Why is it failing? Please help.

Thank you.

Posted 1-May-11 19:08pm

eber yusuf

Updated 1-May-11 21:00pm

v5

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jim lahey · Answer 1 · 2011-05-01T21:04:00

In your error response you see the following text:

Method%20Specified%20is%20not%20Supported

and in your code you have:

C#

objRequest.Method = "POST";

Try changing that line to:

objRequest.Method = "GET";

You're adding querystring variables to the URL, they're generally if not always associated with Http GET.

Ra-one · Answer 2 · 2011-05-01T21:08:00

Try this and provide information that are required, replace it with your details

C#

public string GetSubmitUrl()
{
      StringBuilder url = new StringBuilder();
      url.Append( this.PayPalBaseUrl + "cmd=_xclick&business="+
            HttpUtility.UrlEncode( AccountEmail ) );
      if( BuyerEmail != null && BuyerEmail != "" )
            url.AppendFormat( "&email={0}", HttpUtility.UrlEncode( BuyerEmail ) );
      if (Amount != 0.00M)
            url.AppendFormat("&amount={0:f2}", Amount);
      if( LogoUrl != null && LogoUrl != "" )
            url.AppendFormat( "&image_url={0}", HttpUtility.UrlEncode( LogoUrl ) );
      if( ItemName != null && ItemName != "" )
            url.AppendFormat( "&item_name={0}", HttpUtility.UrlEncode( ItemName ) );
      if( InvoiceNo  != null && InvoiceNo != "" )
            url.AppendFormat( "&invoice={0}", HttpUtility.UrlEncode( InvoiceNo ) );
      if( SuccessUrl != null && SuccessUrl != "" )
            url.AppendFormat( "&return={0}", HttpUtility.UrlEncode( SuccessUrl ) );
      if( CancelUrl != null && CancelUrl != "" )
            url.AppendFormat( "&cancel_return={0}", HttpUtility.UrlEncode( CancelUrl ) );
      return url.ToString();
}

Hope it helps

Bill SerGio, The Infomercial King · Answer 3 · 2013-01-11T04:28:00

Solution 3

Hi,

The error is caused by:

URLQueryString.Append("VERSION=56.0");

You are not supplying a recent valid version--try something over 62 or ask PayPal for a correct version.

Posted 11-Jan-13 4:28am

Bill SerGio, The Infomercial King

HttpWebRequest to send POST data with paypal parameters?

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