IBillIt for AIM and ARB is a single library for integrating with Authorize.net`s AIM and ARB APIs w/bonus features like line order item tracking, totaling, and custom data support. It is Authorize.net certified.

Features: IBillIt was the first library certified by Authorize.net for their Automated Recurring Billing (ARB) service. Using these libraries you will be able to Ensure secure payment transactions over the Internet. IBillIt uses Secure Sockets Layer (SSL) to communicate between your server and the payment processing gateways. So for interfacing your commerce site with the payment processing gateways, this is a tool that`ll reduce a lot of development time and provide you tested components to make such transactions very secure. IBillIt is built in C# under the .NET framework to work with .NET managed code, script, and native code. You are able to use a host of languages and interface with these components very easily. These include Java, PHP, Visual Basic, C#, C, C++, VBScript, JavaScript, Visual Basic.NET, VBA, VB6 and almost any other Windows development environment.

This two in one library has detailed documentation including sample code to make interfacing quite easy. Extra features include the ability to track line order items; totaling of amounts such as taxes and shipping; to include custom data; to set default properties, to avoid redundant code; duplicate billing information; and MD5 Hash Validation support. These are a great help as you would not need to develop code to support these required functions. This package has passed Authorize.Net’s testing and certification process for both AIM and ARB.

Overall: An excellent piece of code that makes your development life easier when integrating a shopping cart to a standard payment processing package.