Full integraton test from API request to UI workflow

Hi guys,

I would like to know if you could give me some recommendations. We have an app that receives post requests, those requests are orders to our system. Once, that they have been created successfully, the user can make adjustments on those orders through the UI, then book them and finally track them.

We would like to create a spec since the POST of an order to our order/create endpoint. Once the orders are in the UI that is fine, but I would like to know what are your recommendations, approach or any advise to make those post requests quite visible in the spec, and as real as possible.