Receiving POST requests with WebFlow endpoints

Hi all!
We’re looking for guidance for building a custom integration with a 3rd party vendor.

Simply put, we need to load a WebFlow page following a POST request we get from the 3rd party server. Specifically, we are planning to get a form field using said POST request and we want to extract and have this field as a hidden form input in the WebFlow page.

The flow for this integration is-

  1. Vendor sends a POST request to our WebFlow endpoint containing a form-data field.
  2. We extract this field from the request.
  3. We display a WebFlow page with a form that embeds the field as a hidden input.

Can you kindly instruct / send us to the relevant documentation regarding such integration option?

Thanks in advance,
Omri