Should/can Sales Pages be created in Infusionsoft?

I wonder if it’s best to use an IS landing page as the sales page. I’m using wordpress but realise there’s no need for that if I have some landing pages that do the job of
1 opt-in,
2 nurture,
3 sell
Please advise whether the IS landing pages can be used to place orders, and what the best options/alternatives are.
Then I assume I will then create an order form to follow on from this.