Authorize.net Integration eCommerce Payment Gateway ( Direct Post Method New! )
https://developer.authorize.net/integration/fifteenminutes/csharp   These steps assume that your web server is on the public internet and can be accessed via a domain name or IP address.  Step 1:Sign up for a Test Account.  Sign up for a test account to obtain an API Login ID and Transaction Key. These keys will authenticate requests to the payment gateway.   Step 2: Download the Authorize.Net C# SDK and include it in your project  Download the SDK    Create a new ASP.NET MVC application and add a reference to the AuthorizeNET.dll from the SDK   Step 3: Modify web.config.  Add the AuthorizeNET.Helpers namespace to the web.config, under system.web/pages:   ...  Step 4: Create a checkout form that posts directly to Authorize.Net  Add the following code to the Home/Index View - this will create a form which will submit a test transaction to Authorize.Net (with hardcoded values). This code uses the SDKs CheckoutFormBuilder to create the form for you - just include your API login and Transa...
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