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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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How to easily integrate and interface with PayPal Express Checkout API from a Windows c++ application
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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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PayPal 

28 Jul 2021 by Moojc
I'm starting to use PayPal for payments with .net Core. I created a sandbox app and checked client id and secret. I get an error at content "{"error":"invalid_client","error_description":"Client Authentication failed"}" Code: private...
27 Jul 2021 by SeeSharp2
I would suggest you contact paypal. You are either not including something, like a certificate, or the credentials you have are wrong.
28 Jul 2021 by Richard Deeming
Quote: $"{_configuration["PayPal:clientId"]} : {_configuration["PayPal:secret"]}" You're adding a space to the end of your client ID, and a space at the start of your secret. Instead of sending: xxx:xxx you're sending: xxx : xxx ...
14 Mar 2008 by Farshid Zavareh
A CAPTCHA control that is simple, secure, and easy to use.
13 Dec 2011 by gediya84
Dear Member,I want to integrate My online shopping website to paypal.can you given me example of multiple item purchase at a time.Thanks in advance,Thanks You,Harshad D. Gediya[Edit - Contact Number Removed.]
13 Dec 2011 by thatraja
Check thisUse of the PayPal payment system in ASP.NET[^]
11 Oct 2013 by ASP.NET Community
Adapter PatternThe gang of four definition is "Convert the interface of a class into another interface clients expect. Adpater lets the classes
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
17 Apr 2014 by Mishra Laxmikant
Always getting exception The request was aborted: Could not create SSL/TLS secure channel. Please help CallerServices caller = new CallerServices(); IAPIProfile profile = ProfileFactory.createSignatureAPIProfile(); // Set up your API credentials, PayPal end...
18 Feb 2010 by Tiago Conceição
Application Management makes your application's life easier. It will automatically do memory management, handle and log unhandled exceptions, profile your functions, make your application single instance, and also provide utility functions to get system information.
25 Nov 2012 by here_is_kunal
I'm developing a system where a payment option is there. I would like to do the payment procedure in Authorize.net web server, not in my web server. Is this possible. If possible the please tell me how?
25 Nov 2012 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...
1 Jun 2012 by dinhienhy
I'm developing a bidding system and using paypal method.Now, I want to my sytem auto send payment to a paypal account in a background.We will store paypal account of system such as email, signature...I'm a newbie paypal. I use .net to develop this system.Please give me a...
1 Jun 2012 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...
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[^]
27 Mar 2018 by Member 12436884
I have a rough time integration with my desktop application. Here is what I want to do. I want to make a button in my app (not web application) calls Paypal Payment Web Page and can get notify when users finished(cancel, succeed event they close website) payment. I have one more...
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.
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 Nochexman
Hi sathya.spidy, where are you - are you in the UK?
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.
28 Apr 2017 by Member 10355610
I am trying to implement paypal pro credit card payment in php I get following error no matter what i do. Could not resolve host: api-3t.sandbox.paypal.com Its a DNS problem of computer I think. But are there any chances of CODE being wrong? What I have tried:
28 Apr 2017 by ZurdoDev
It means that it cannot find that url. Why? You'll have to troubleshoot to know for sure. Perhaps you have a firewall blocking it. Perhaps you have the url wrong. Maybe your network is blocking it. There is no way for us to know. When I try to access that url in the browser I get a Page...
20 Sep 2019 by JordanTrajkov
Hello, I'm trying to create new product, plan and subscription using paypal REST API. I'm using c# code in .net. Everything works find but the response is with status: 200 and it means OK but in the documentation I see that I have to receive a response with status: 201 CREATED. Also in my...
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...
2 Dec 2010 by Payflow Pro
A guide to creating automated reports with PayPal's Payflow Pro
31 Oct 2013 by BenJBaker╣
I have an application that requires the user to make a payment on PayPal before returning them to the webpage, upon returning to the webpage some thinks are activated using session variables that are set before the user is forwarded to paypal. On the confirmation screen it gives the user the...
1 Nov 2013 by BenJBaker╣
Just thought I'd answer my own question in case anyone else wants the answer, I contacted PayPal and...When a customer makes a payment through PayPal they are automatically asked whether they would like to return to the merchants website or go directly to PayPal.As this is a setting...
15 Feb 2013 by Hamza M. S. Abazeed
Hi all :)I want to ask, if I can make a donate page that take CC information to transfer mony to paypal accountis that possible ? if so, anyone can provide me the code to do that please ?thanks in advance
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...
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...
31 Oct 2014 by Christoph Buenger, DaSpors
How to easily build an online shop with the Scavix PHP Web Development Framework.
6 Mar 2018 by Mirza Arshad
When i link eBay sandbox account with paypal existing sandbox then it redirect me on Paypal create test account page where name and address fields not showing. therefore i am not able to link eBay account with sandbox. i have describe the link below for see the details of error: When Link...
6 Mar 2018 by ZurdoDev
You will need to contact eBay.
16 Mar 2013 by zubair610
HiI need to add Paypal chained payment to my website in which a primary receiver send payment to secondary receiver using c# ASP.NETThanks in advance
16 Mar 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...
10 Mar 2011 by Payflow Pro
An article on embedding PayPal payments into your site
23 May 2011 by gowthammanju
Hi All,I need to embed the internet banking in my project in asp.netCan i know some procedures to implementNeed options like amount transfer, etc...!Awaiting for your responses.Thanks in Advance.
23 May 2011 by Richard MacCutchan
You probably need to start at the PayPal site[^].
8 Nov 2010 by Chris_Hall
Increase customer conversion rates with PayPal's Guest Payments and other features of the Adaptive Payments APIs
18 Nov 2006 by BlaiseBraye
With this web control, you will be able to prevent spammers on your webforms (validation inplemented).
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 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.
19 Sep 2018 by Arun Kumar K S
Any one know how to pass amount to IPN I passed user id using custom variable but how to pass more than one details to IPN how to pass more than one custom value to IPNinput type="hidden" name="custom" value="" In IPN code I used this. String strUser =...
19 Sep 2018 by Farris F Al Harbi
Seperate the custom values with a comma "," And then explode with the comma inside your ipn file. Very simple.
1 Dec 2013 by Manish Kumar Namdev
Hi friends,Nowadays a trend is running like to register a user via his social login id.For my purpose I am using paypal user.Concept is a user come and click on login and redirects to payapl site after authentication and other verification i get its unique id whatever and then I ...
29 Dec 2014 by Gurjeetlidher
Getting an error "Security Header is not valid" while making webiste payment pro API call. any help in this regard will be appreciated.
29 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...
22 Jul 2017 by Member 13323218
George the script is NOT working for me either. Did you ever find a solution? Please let me know and my email is : navalofficer0707@gmail.com Thank you
14 May 2015 by Devendra Sarang
Hello Friend,I am developing website from last 6 months in ASP.net and PHP .Now i am getting requirement for making "ECOMMERCE" website with Payement Gateway paypal, ccavenue, pay2u etc..but i don't know anything about payment gateway.even i don't know how to implement...
30 Apr 2015 by Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)
My previous answer - How to create payment gateway from asp.net[^].
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...
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...
8 May 2014 by akashjg
Hellow,In the web site that i implement, using ASP.NET and C# i finish my shopping card and i want to integrate a paypal checkout i read many things and i found them very confusingon paypal.developer.com,Do you know how can i start or has anyone any example of how to use paypal...
8 May 2014 by King Fisher
Click Here[^]
2 Jan 2014 by gauravrawat
HiMy question is that i want to integrate paypal. but want Paypal skin appears on our webpage (not redirected to paypal site).when ever user want to make payment using paypal(paypal account or credit card) this should not redirect to paypal web site. the interface of paypal should be...
2 Jan 2014 by OriginalGriff
This sounds like a system for harvesting Paypal login info: as such it would be illegal and immoral and this site has nothing to do with anything like that.
2 Jan 2014 by Sampath Lokuge
I have found some useful links for you.Check out this.pay with paypal details without redirecting to paypal sitePayPal Advanced credit card payment forms without redirectPayflow Pro
2 Jan 2014 by Nagy Vilmos
All you need to get started is here[^]. I, and others, am curious as to why you don't want to go via paypal's site. The reasons to do it far outweigh any reason not to. If you openly show payment is via paypal then users will be given an added level of confidence. If you try to hide it and...
7 Jul 2014 by Peter Leow
Any article related questions should be posted at Article Writing[^]I do not think it is allowed and it should not.
4 Jul 2021 by Simon_Whale
I haven't tried this so I started with a google django paypal integration - Google Search[^]
4 Jun 2020 by Member 13779417
Below is my IPN Listener which has always worked fine on my website for customer PayPal payments. It sets up orders for my site in the Guid format (32 digits with 4 dashes). However, I use the same PayPal account for my Ebay selling and I have...
30 Sep 2014 by Member 11121464
Hello everyone!I have recently installed UserCakes registration/user system on my website.I want to make it so that registration is available only to users that pay a monthly fee.Does anyone have any advice on how I would go about doing this or where I could get some information? I'm...
7 Jul 2019 by Truck53
I am trying to send an item list using the paypal version 2 button. I am trying to send a list that is static before I try to send a dynamic list. To my understanding, my items sould be posted to my IPN script. I created an IPN script and nothing being posted to the script. I checked the...
4 Jun 2015 by Pardeep Rajput
how do i send soap request to paypal using c# ?
4 Jun 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...
17 Mar 2016 by Greesemonkey3
I set up paypal's IPN on my website and it works great! I now would like to know how to use adaptive payments (chained payment) so that once I receive an IPN from Paypal I will then be able to go to a different page and setup the chain payment to take my cut, pay seller 1, and sales person...
17 Mar 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...
1 Jan 2023 by Dan Sep2022
Hello everyone, I have to make a in-app purchase feature that allow the user to buy an account upgrade in .NET Winforms, so this is what I comes up with: private void _setupPayment(String TypeOf,String Pricing) { string url = "";...
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,...
20 Apr 2020 by Member 14618136
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. P.S. I'm not the one who integrates this to our website but my senior developer is already resigned and I am...
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,...
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.
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 ?
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[^]
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...
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...
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...
17 May 2013 by CHAITANYA KIRAN KASANI
hiI Have a Custom Created shopping Cart GridView..In That Gridview Footer Total Amount Of Items is Displayed..Now I Have A Button "Buy Online"..When I Click On The Button The GridView Footer Total Amount Should Be Integrate With The Paypal And Ask For Credit/Debit Card Details...Please...
23 Dec 2014 by Gurjeetlidher
i have created the parameter list, can anyone tell how to make API(WebSite Payment Pro) call?
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...
18 Feb 2013 by Member 9845850
How to send automatic Email confirmation messages to Buyers when they completed transaction in my website(while staying in site) using PayPal Payments Advanced method with PayPal Manager configured to receive money.
10 Jan 2013 by Yaseer Arafat
I have used Credit Card as tender for Recurring Billing.This code running fine.But Now I want to use PaypalExpress Checkout and create recurring profile. string msg = ""; // Create the Data Objects. // Create the User data object with the required user details. ...
11 Jan 2013 by Yaseer Arafat
protected void Page_Load(object sender, EventArgs e) { if (Request.QueryString.Count != 0) { if (Request.QueryString["token"] != null) { if (Request.QueryString["token"] == "") { ...
3 Jun 2019 by Member 14478988
I have created the Business Facilitator and Buyer account. and integrated the sample code(API) provided by paypal community. but i am stuck in between. i have no clear idea what details i should know and how do i achieve the recurring billing integration. What I have tried: I have created the...
3 Jun 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....
3 Jun 2019 by MadMyche
You use the Subscriptions API Subscriptions API - PayPal Developer[^]
31 Oct 2014 by PIRATHAP
I need all transaction history from payflow pro, my request string TRXTYPE=I&TENDER=C&PARTNER=PayPal&VENDOR=SuperMerchant&USER=SuperMerchant&PWD=XXXXXX&ORIGID=VPNE12564395&VERBOSITY=HIGH My response is a single transaction details but I need all transaction history.Is there any possibility...
28 Feb 2013 by charan1431
I am using paypal direct payment API.For thatI have registered in manager.paypal.com and followed the procedure for set up and customize and then I have saved and publilshed. Now I want that layout code.Can u tell me how to get this code?
28 Feb 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...