How can I use an existing Item (which I create via the API) for a form submission. I want to create this Item, because I need to add an USER ID to the form data. The USER ID comes from our system and identifies the user context of the form.
Maybe there is any other way, to add this USER ID to the form data? I tried with query parameters, but this is not supported yet.
The USER ID is mandatory, if I receive the data via webhook, after the form was submitted.