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Editorial Team
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Asked: 2026-05-23T19:50:46+00:00

I have a (hopefully) basic question on credit card processing, particularly using Authorize.Net. This

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I have a (hopefully) basic question on credit card processing, particularly using Authorize.Net. This is my first foray into credit card processing so I have been reading up on it quite a bit.

Let me describe what I am trying to do. I am in the process of building a POS application (WinForms) that receives all it’s data from my mvc3 based web service.

I want to include a credit card swipe & receipt printer with this solution. My thinking here is that I have the client app collect all relevant info (cc#, expiration date, name, etc) and call up to my webservice. Once I am in my webservice I would then call out to Authorize.Net, making a card present transaction.

Am I missing anything here? Is it ok to make card present transaction from a web server? Anything to watch out for? Should I be looking at AIM (Advanced Integration Method) instead?

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  1. Editorial Team

    Windows App <=> Your Web Service <=> Authorize.Net

    I’m not sure how you connect: Windows App <=> Your Web Service

    Your Web Service <=> Authorize.Net is not hard. I have done few projects using Authorize .Net Payment.

    1) You need HTTPS for your web service

    2) Inside your web service, post to “https://secure.authorize.net/gateway/transact.dll” along with parameters.

    3) Once approve, you will get TransactionCode. If fail, you will get error message.

    Edited: 

    WebClient webClient = new WebClient();
NameValueCollection nvc = new NameValueCollection();
nvc.Add("x_login", loginId);
nvc.Add("x_tran_key", transactionKey);      
...                  
Byte[] data = webClient.UploadValues("http://developer.authorize.net/guides/SIM/Appendix_B/Appendix_B_Alphabetized_List_of_API_Fields.htm", nvc);

    Guide: Authorize.Net

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