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by Dmitri Nеstеruk
Let's create a simple project estimation DSL using F#!
by ortund
Allow purchases via PayPal on your website
by jnegron215
This short tip will show you how to extend PayPal's .NET API by adding new members to their objects and page-level functions that will help provide a smooth error-handling experience.
by echokilo
A simple tip to avoid the pain caused by PayPal providing code snippets for buttons each in its own form tag

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by Michael Haephrati
How to easily integrate and interface with PayPal Express Checkout API from a Windows c++ application
by Visveswaraiah
PayFlowPro Hosted Checkout page is a payment service from PayPal that helps you meet PCI compliance.
by jnegron215
This short tip will show you how to extend PayPal's .NET API by adding new members to their objects and page-level functions that will help provide a smooth error-handling experience.
by Christoph Buenger, DaSpors
How to easily build an online shop with the Scavix PHP Web Development Framework.

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16 Aug 2009 by Dmitri Nеstеruk
Let's create a simple project estimation DSL using F#!
7 Aug 2011 by Monjurul Habib
You can follow any one of the following link:Integrating PayPal Paymentsinto E-Commerce Applications with ASP.NETUsing The PayPal Payment SystemOnline Payments Using PayPal- Integration with ASP.NETOr you can download the dashCommerce to find the payment system...
16 May 2013 by ortund
Allow purchases via PayPal on your website
26 Aug 2014 by Abhinav S
Try the following -PayPal Gateway Integration in ASP.NET[^]Introduction to PayPal for C# - ASP.NET developers[^]Video - How to integrate Paypal into ASP.Net [^]How to integrate PayPal in Asp.Net[^]Paypal Integration Code: Using ASP.Net / C#[^]
12 Oct 2015 by jnegron215
This short tip will show you how to extend PayPal's .NET API by adding new members to their objects and page-level functions that will help provide a smooth error-handling experience.
1 Jun 2012 by Prasad_Kulkarni
Please refer:Introduction to PayPal for C# - ASP.NET developers[^]Also my answer for similar question: I want to integrate Paypal to my asp.net website using Paypal API[^]
14 May 2014 by echokilo
A simple tip to avoid the pain caused by PayPal providing code snippets for buttons each in its own form tag
26 Jun 2016 by Visveswaraiah
PayFlowPro Hosted Checkout page is a payment service from PayPal that helps you meet PCI compliance.
20 Apr 2020 by Patrice T
Quote: I need help with this error message. I'm new in this Paypal integration I just want to know what is the possible cause of this error. Short answer: There is only 1 place where you can have reliable answer, ask PayPal support service.
1 Jan 2023 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money. You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account,...
29 May 2009 by yordan_georgiev
Provides a demo for a generic page presenting the contents of a database.
7 Oct 2010 by Rod Kemp
This code works fine for me.405 errors often arise with the POST method, however not all ISPs allow the POST method necessary to process the request.All 405 errors can be traced to configuration of the Web server and security governing access to the content of the Web site, so should...
21 Oct 2010 by raju melveetilpurayil
This must help you. Now Paypal have better documentation. They explained very well with sample code. PayPal Integration Overview[^]
7 Jul 2011 by OriginalGriff
Talk to paypal.Seriously. Do not accept any suggestions from anyone other than the company involved when you are dealing with real money. If you do, you are leaving yourself wide open to fraud, and you personally may be responsible for any losses.Talk to paypal: I believe they even...
6 Aug 2011 by thatraja
At least you should have searched in webUse of the PayPal payment system in ASP.NET[^]Introduction to PayPal for C# - ASP.NET developers[^]
13 Sep 2011 by abiruban
Haiia'm trying to integrate a website with the express checkout and recurrent payments. The express checkout works fine, I mean, we redirect to paypal, then back to our site where the payment is confirmed and everything works like a charm.But when trying to integrate the...
15 Oct 2011 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
27 Oct 2011 by Espen Harlinn
Here is a feature complete project:http://ofbiz.apache.org/[^]What you're asking for can't really be given a "Quick answer". Use OFBiz as a reference implementation, as it provides a solid data model and implmentation.Java isn't that hard to read for a c# developer - so dive in, it might...
26 Oct 2011 by BillWoodruff
The most practical immediate advice I can give you is to post a question on the Lounge briefly describing that you are creating an on-line store, and asking for opinions of CP members on what products for .NET they currently use and recommend. I suggest you avoid using any language in this post...
17 Nov 2011 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
20 Apr 2012 by Abhinav S
You can start with the PayPal API as described here[^].
20 Apr 2012 by Prasad_Kulkarni
Please refer following threads:Introduction to PayPal for C# - ASP.NET developers[^]Use of the PayPal payment system in ASP.NET[^]http://www.spiderweblogic.com/[^]PayPal Help[^]
30 Apr 2012 by Sandeep Mewara
Look at this article: Introduction to PayPal for C# - ASP.NET developers[^]Also similar question answered here: How Integrate my Shopping Cart to Paypal[^]
29 May 2012 by Prasad_Kulkarni
Please refer:Introduction to PayPal for C# - ASP.NET developers[^]Use of the PayPal payment system in ASP.NET[^]Integrating PayPal Payments[^]Online Payments Using PayPal- Integration with ASP.NET[^]Using the PayPal Payment System in ASP.NET[^]PayPal[^]Similar...
9 Jun 2012 by Sergey Alexandrovich Kryukov
How about this part of the API:https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_APPreapproval[^]?—SA
10 Jun 2012 by Sandeep Mewara
Have a look at these if it helps:[PDF]: PayPal SOAP API Developer Reference[^]Sending an API CAll with PayPal SOAP API[^]
12 Sep 2012 by Sandeep Mewara
PayPal provides an SDK for Payflow Pro to help you integrate.Details here: Payflow Pro[^]Try!
11 Oct 2012 by Prasad_Kulkarni
Please refer:Introduction to PayPal for C# - ASP.NET developers[^]Use of the PayPal payment system in ASP.NET[^]Integrating PayPal Payments[^]Online Payments Using PayPal- Integration with ASP.NET[^]Using the PayPal Payment System in ASP.NET[^]PayPal[^]Similar...
10 Jan 2013 by fjdiewornncalwe
All you have to do is follow the instructions here[^] by translating those actions into the remotePost commands you are using right now.I fear that google is not working for you: "Paypal Refund Transaction API" gave me this link right off the bat....
20 Jan 2013 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
15 Feb 2013 by OriginalGriff
Even if we did "just provide code" we wouldn't in this case.Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the...
24 Sep 2013 by phil.o
This is not how things work here.You could start here[^] and here[^]Remark: added as solution so that this question doen not appear in the not answered ones.
30 Sep 2013 by idenizeni
Introduction to PayPal for C# - ASP.NET developers[^]
30 Sep 2013 by ridoy
Also Check:Checkout and Payment with PayPal [^]andPaypal Express Checkout with C# using Paypal web services[^]
19 Dec 2013 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
21 Mar 2014 by Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)
It's due to Payment Gateway, I believe.Please check the code, you must be missing something. If you are referring any articles, then ask the author of that article about this issue. He/she is the best person to answer this to you.On the other hand, you can discuss this in PayPal forum....
26 Nov 2014 by Sergey Alexandrovich Kryukov
It's possible that you are sending it nowhere. The SmtpClient constructor you are using is based on assumption that you chose you SMTP server and all the parameter by writing appropriate configuration file:http://msdn.microsoft.com/en-us/library/k1c4h6e2%28v=vs.110%29.aspx[^].Who knows...
23 Dec 2014 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
19 Jan 2015 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
30 Apr 2015 by Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)
My previous answer - How to create payment gateway from asp.net[^].
30 Nov 2016 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money.You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third...
30 Nov 2016 by F-ES Sitecore
They use POST so you need Request.Form or to use model binding. There are plenty of PayPal integrations out there and the process is well documented by PayPal itself so you should get familiar with the documentation.
16 May 2017 by W Balboos, GHB
Why do you have two separate forms? You submit them both but why do you expect the value from one form to be transferred to another or even get through at all? Having the same name doesn't do it: they're two separate instances. Ways to make it work: Put everything in one form so all data...
18 Apr 2018 by OriginalGriff
When you asked this question yesterday: How to integrate paypal SDK to windows application ?[^] you were told what to do. That advice has not changed. Except I would add this: Never, ever, accept code from a insecure website to handle anything to do with real money. You do not know who is...
31 Jul 2019 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money. You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third parties....
20 Sep 2019 by MadMyche
A couple of things I noticed when comparing your work to the documentation and the sample code. 1. You are using the GetAsynch() method, their sample is using POST 2. You are missing at least one required attribute: Type Sample provided for Create Product on Catalog Products API - PayPal...
20 Apr 2020 by OriginalGriff
Never, ever, accept code from a insecure website to handle anything to do with real money. You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account,...
18 Nov 2020 by Richard Deeming
Read the documentation[^]. Follow their examples. If you still can't get started, either contact PayPal support, or hire a developer to write the code for you.
5 Jun 2022 by OriginalGriff
This is not a recruitment site: . If you want someone to write your code, you have to pay - I suggest you go to Freelancer.com and ask there. But be aware: you get what you pay for. Pay peanuts, get monkeys.
15 Aug 2006 by Dino Esposito
Learn how to really test your SOA Web Services with maximum efficiency during the development cycle.
2 Apr 2007 by Jeppe Mortensen
A new way of selling software has emerged. Making money trying to sell small size programs is not easy. Let’s change that! We are currently guaranteeing 150$ revenue for the first 300 developers who upload their program and starts using the system described in this article.
7 Apr 2009 by Anna-Jayne Metcalfe
Last night's reception at Maximilian's restaurant on Friedrichstraße was great fun. Good food, great beer (I particularly liked the Berliner Weiß) and fantastic company. After breakfast we set up our stand in the sponsor's area (complete with the usual last minute presentation edits).
12 Jul 2010 by Chris_Hall
This article shows you how easy it is to process and track mobile payments with PayPal.
8 Sep 2010 by Chris_Hall
Innovate 2010, the PayPal X Developer Conference, offers 2,000 developers a chance to learn more about how technology and payments intersect.
7 Oct 2010 by Metrakay
Using beautiful article "http://www.codeproject.com/Tips/84538/Setting-up-PayPal-Instant-Payment-Notification-IPN.aspx?fid=1573899&df=90&mpp=25&noise=3&sort=Position&view=Quick[^]" I have created sandbox accounts, sandbox seller, ipn_pal.htm, set the ipn url to match, gone to the ipn test...
8 Nov 2010 by Chris_Hall
Increase customer conversion rates with PayPal's Guest Payments and other features of the Adaptive Payments APIs
10 Nov 2010 by NetMan2012
hello,I have a website running on 1and1 hosting server. It has a shopping cart,for payment we are taking customer to paypal website and are using paypal ipn to update our database after successfull payment. The problem is 1and1 server is not allowing paypal ipn to do any processing, hence...
22 Nov 2010 by NetMan2012
Hello,I have been facing a problem. I have a website that has a shopping cart integrated. At payment I am taking the customer to paypal website and after successfull payment, paypal IPN updates my database with the success status, the issue is paypal IPN is not been able to do its processing...
22 Nov 2010 by NetMan2012
Hello,How can I set print a session object value when I am providing PayPal IPN the URL? I want to print the value after the URL because we provide a static URL to PayPal IPN. I also want to assign it the value of a session object currently running in the browser so that when PayPal IPN...
29 Nov 2010 by fjdiewornncalwe
If you look on the homepage of 1and1, you'll see that they offer ecommerce services. That likely means that they will block anyone who subscribes to their services from using anything other method of ecommerce. Check out your hosting agreement and see if that is the case. If it is, that is why...
29 Nov 2010 by Dalek Dave
Time to get a new hosting company, unless you have the facilities to host your own site.Look around and get quotes.
30 Nov 2010 by Rajesh Anuhya
May be your hosted server.., is stopping the paypay nt connection., chack with your hosting provider is there any firewall is working between paypal and hosted server...
2 Dec 2010 by Payflow Pro
A guide to creating automated reports with PayPal's Payflow Pro
10 Mar 2011 by Payflow Pro
An article on embedding PayPal payments into your site
18 Apr 2011 by Member 7768932
Hi Guys!I am having trouble integrating API of Paypal(Website Pro) and API of Autorize.net :( Do you guys know another much easiest way? or BEST API to use? I want my website to accept payment from Credit Card/Debit Card. ANY tips?Please help me Masters! :) Thank you!!
18 Apr 2011 by Sandeep Mewara
You should have just done: Google search: c# credit card payment[^] and got links like:Credit Card Payment Processing with ASP.NET [^]Similar discussion 1[^]If you are having issues with Paypal, go through these CP articles:Introduction to PayPal for C# - ASP.NET developers[^]Use of...
2 May 2011 by Member 7768932
Hi Guys!Help, I've hosted my site on goDaddy and goDaddy's running a Medium Trust Level only. And Paypal Pro says it's only running in Medium Trust.Is there a way to fix this? Is there anyone encountered this problem before? I've red on some forum they fixed the same problem but didn't...
23 May 2011 by Richard MacCutchan
You probably need to start at the PayPal site[^].
20 Jun 2011 by sathya.spidy
Hi friends, I m developing a Website which deals with online payment. is there any coding for online payment like paypal, credit card payment. i anyone know the coding please refer to me. Thanks,
20 Jun 2011 by Christian Graus
I have an article on this site, paypal has samples, surely you want to be more serious about accepting online payments than asking for random strangers to do it for you, without doing any research ?
20 Jun 2011 by R. Giskard Reventlov
If only there was a place I could go and search for articles to help me...PayPal[^]
20 Jun 2011 by OriginalGriff
I would backup Christian on this: asking random people for information is one thing, asking them for code to handle your online payments is downright stupid. How do you know that the payment and / or customer information is going to you, or only to you? It would be relatively simple to provide...
20 Jun 2011 by Ramalinga Koushik
Hope Introduction to PayPal for C# - ASP.NET developers[^]an article from CP might help you.
21 Jun 2011 by Dylan Morley
Have a look at nopCommerce[^]There are multiple projects in the Payment folder that all implement an IPaymentMethod interface. There are examples for Payal and various other payment providers. It's an excellent open source project that I recommend you download and review.
7 Jul 2011 by lava123
Hi I want to know how to integrate paypal for membership website
7 Jul 2011 by Prerak Patel
Check this outhttps://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_overview[^]
11 Jul 2011 by jj taylor
I have a Silverlight 4 LOB application to which I would like to add a simple subscription service. Have set up a secure WCF service which returns a valid paykey. The question is how to utilise this resource in Silverlight without exposing the key on the client. A simple solution that works...
6 Aug 2011 by thejowker
I already have a Shopping Cart in my website I need to connect it to paypal...i already avail a card for paypal...what do i need to do to connect my cart to paypal and get the grandtotal of my cart to paypal...
6 Aug 2011 by Christian Graus
Is the paypal site down ? Doesn't seem to be. having read their documentation and done what they say you should do, where are you stuck ?
13 Sep 2011 by MaulikDusara
Hi,http://forums.asp.net/p/1719516/4592762.aspx/1?Paypal+Recurrent+payments+invalid+token[^]
13 Sep 2011 by abiruban
MaulikDusara2....
17 Sep 2011 by abiruban
hiit's workinghttp://forums.asp.net/t/1719516.aspx/1?Paypal+Recurrent+payments+invalid+token[^]
18 Oct 2011 by NetMan2012
I've not done any SOAP WSDL sending before. I have not a clue how to make a call using the latest PayPal WSDL. I added the service reference but how do you actually make the CALL and send the request over the wire?I am stuck badly and need help...Thanks
18 Oct 2011 by wonder-FOOL
Well you should go to PayPAL API page. There should be available documentation for you to read and get you started. You can find some sample codes from this link:PayPAL code samples[^]This link in CP gives you a brief definition and i think it is one of the best starter...
20 Oct 2011 by JawadHafiz
I created account in Paypal sandbox and linked it till paypal site but I don't know how to get Transaction Id and after completion of payment or Cancel to return to our website.one more issue is Sandbox gives error when i login with personal sandbox Id to make payment for testing purpose.I...