Help with Paypal IPN (Instant Payment Notification)

[bolossis]

Hi, i try to use paypals IPN (Instant Payment Notification)

I have a paypal express checkout button on my form and after a successfully payment paypal send me a confirmation.

Its works ok i also get success from paypal side (IPN was sent and the handshake was verified.)

 

The problem is that i can't get the request text that paypal send to me. I will use the request text on a memo in my session.

Have somebody any idea how to make this?

 

i use TIdHTTPServer, TIdHTTPand TIdSSLIOHandlerSocketOpenSSL places on the UniServerModule form with following settings

object IdHTTPServer1: TIdHTTPServer
    Active = True
    Bindings = <>
    DefaultPort = 82
    AutoStartSession = True
    OnCommandGet = IdHTTPServer1CommandGet
    Left = 60
    Top = 80
  end
  object http1: TIdHTTP
    IOHandler = OpenSSL
    AllowCookies = True
    ProxyParams.BasicAuthentication = False
    ProxyParams.ProxyPort = 0
    Request.ContentLength = -1
    Request.Accept = 'text/html, */*'
    Request.BasicAuthentication = False
    Request.UserAgent = 'Mozilla/3.0 (compatible; Indy Library)'
    HTTPOptions = []
    Left = 175
    Top = 80
  end
  object OpenSSL: TIdSSLIOHandlerSocketOpenSSL
    MaxLineAction = maException
    Port = 0
    DefaultPort = 0
    SSLOptions.Method = sslvSSLv23
    SSLOptions.Mode = sslmClient
    SSLOptions.VerifyMode = []
    SSLOptions.VerifyDepth = 0
    Left = 215
    Top = 140
  end

and the code i use is

procedure TUniServerModule.IdHTTPServer1CommandGet(AContext: TIdContext;
  ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
var
  strWrite : TStringList;
  strRead  : String;
begin
  strWrite := TStringList.Create;
  try
    strWrite.Add(ARequestInfo.FormParams+'&cmd=_notify-validate');
    IdHTTP1.Request.UserAgent := 'application/x-www-form-urlencoded';
    IdHTTP1.ReadTimeout := 0;
    IdHTTP1.IOHandler := OpenSSL;

    strRead := IdHTTP1.Post('https://www.paypal.com/cgi-bin/webscr', strWrite);   // If you are in live
    //strRead := IdHTTP1.Post('https://www.sandbox.paypal.com/cgi-bin/webscr', strWrite);  // If you are in sandbox

    TThread.Synchronize(nil,
      procedure
      begin
        MainForm.UniMemo1.Lines.LoadFromStream(ARequestInfo.PostStream); //not works :-)
        //or
        MainForm.UniMemo2.text := strRead;
        MainForm.UniMemo2.Lines.SaveToFile(Uniservermodule.FilesFolderPath + 'test.txt'); //not works :-)
      end);

  except
    on E: Exception do
    begin
      showmessage('Error encountered during POST: ' + E.Message);
    end;
  end;
  strWrite.Free;
end;

Any Suggestion on how to print out the ARequestInfo informations???

 

 

Thanks

 

 

[Marlon Nardi]

Change you code:

TThread.Synchronize(nil,
      procedure
      begin
        MainForm.UniMemo1.Lines.LoadFromStream(ARequestInfo.PostStream); //not works :-)
        //or
        MainForm.UniMemo2.text := strRead;
        MainForm.UniMemo2.Lines.SaveToFile(Uniservermodule.FilesFolderPath + 'test.txt'); //not works :-)
      end);

to example

var  
  FS: TFileStream;   
--
  FS := TFileStream.Create(Uniservermodule.FilesFolderPath + 'test.txt', fmCreate)
  try
    FS.Seek(0, soFromEnd);  
    FS.Write(Pointer(ARequestInfo.PostStream)^,Length(ARequestInfo.PostStream));
  finally 
    FS.Free 
  end

Another detail, your call must be within an active session.

In this case you are trying to manipulate an object that is not in a session, it is only in ServerModule.

 

This here in the server module is not a good idea:

 

MainForm.UniMemo2.

 

 

[bolossis]

Thank you for you answer!

 

I have transfer everything into UniMainModule but this still no work

i cant get print out a file with the response info from paypal.

 

I have put the IdHTTPServer and other into mainmodule and just try to save into file.

I become an error of "Could not bind socket. Address and port are already in use”, then change idHTTPServer port to 0, but i cant take the response data.   

 

i try the code bellow too

var  
  FS: TFileStream;   
--
  FS := TFileStream.Create(Uniservermodule.FilesFolderPath + 'test.txt', fmCreate)
  try
    FS.Seek(0, soFromEnd);  
    //FS.Write(Pointer(ARequestInfo.PostStream)^,Length(ARequestInfo.PostStream));  error in size
    FS.Write(Pointer(ARequestInfo.PostStream)^,FS.size); //i change this
  finally 
    FS.Free 
  end