oic Gen-3 payload request received from trigger can use into integration

Summary:

if I have an integration with a Rest Adapter trigger and as a request body I have a json, now I would like to be able to register on ATP the json that arrives as a request body from the client that launches the integration

Content (please ensure you mask any confidential information):

hello I wanted to ask you a very important question:
if I have an integration with a Rest Adapter trigger and as a request body I have a json, now I would like to be able to register on ATP the json that arrives as a request body from the client that launches the integration. How can I do it? I cannot get the initial json from the integration but only the payload that the trigger works which is then case sensitive on the names of the json fields.