One of the primary strengths of the Kentico e-commerce platform is that it can be customized with relative ease. Honestly, this one of the main reasons that my team and I decided to go with Kentico in the first place. The Kentico API and provider object model is top notch, and it can be extended to do just about anything. This is especially true in the e-commerce pillar of the all-in-one solution. Do you need to integrate your Kentico e-commerce site with an ERP system, roll your own custom payment gateway implementation, or sync up with a shipping carrier's API? Have no fear, all of these tasks are totally accomplishable in Kentico.
With that being said, one of the most common requests that we get at BizStream when building a custom e-commerce site in Kentico is the ability for B2B users to make purchases via the use of a Purchase Order Number (PO Number) instead of a standard credit card payment method. That's one feature that isn't totally 100% out of the box when you have a custom checkout process. Again this task is not a tough issue, and there are many helpful links to get you started in this area if you need to.
Funny enough, we are actually currently working on a project that has this requirement in Kentico 9 (yes this is actually a Kentico MVC site too). And after demoing the working functionality to the client, we received a question of how to then look up orders in the administrative interface by a PO Number. And that is something that I didn't have an immediate answer for. After doing some quick research, it turns out that this customization is not that hard to do.