Hi Xavi, in your request, you see the payload and it just dont appear. Or is it not appearing on the request?
when we are using payload, some integrations prioritize payload elements instead of other elements (depending of how we are sending the payload)
On another hand if you send payload in a bad way, Dialogflow will unrecognize it from the raw request api and when it sends the request to the API that code snippet will be deleted.