There are many ways to solve this. You could create your own cart and order system with Kirby, but that would require quite some custom dev work. There are services like Snipcart that make this a lot easier though. For our own license shop, we use Paddle.

Yes, you can replace our template engine with your favorite one via a plugin.

Our page cache gets flushed automatically on updates via the panel. This performs really well as you can see on our own site. We got quite some traffic from being #1 product on product hunt and all sorts of other launch-related traffic spikes.

Kirby has three different default cache engines. It starts simple with a file cache, but you can also switch to APCU or Memcached. You can also create your own cache engine plugin – for example for something like Redis.

We have tons of default fields that can be extended with custom field plugins: https://getkirby.com/docs/reference/panel/fields But we extend this even further with our section system. With this, you can set up the entire interface for each page type in the way that fits best. You can see this in action here: https://getkirby.com/docs/guide/blueprints/layout

Any kind of simple PHP hosting works. That can be a cheap shared hosting package or a VPS. You can find more about the requirements here: https://getkirby.com/docs/guide/installation#requirements I can't tell if it's working on Now. We haven't tried that yet. But you can also use it as a data source for static site generators, or use Kirby itself as static site generator. In this case you end up with static files and they can be hosted everywhere. But you still can make use of our powerful admin interface.

Thank you very much for the kind feedback Fabio!