Need clarification on correct REST payload format for get_next_rwmobile_page API

Summary:

We are testing the Redwood RF API for Oracle Cloud WMS and are able to successfully render the Redwood Mobile screen.
However, when we attempt to send the input back to proceed with the next step, we consistently get a "Required field" dialog response.

API:

https://****/****/wms/lgfapi/v10/htmlrf/get_next_rwmobile_page/

We would like to know the correct request payload format ( what is the format or tag we need to send) to send in the next POST call so that the API accepts our input . Most of the time we are receviing below error:

{
"type": "dialog",