So when you first initialised your API call, it would’ve given you the option to define the type of each field. In your case I’m guessing they’re all just text fields due to their nature.
This means you can create the 3 parameters as I mentioned above, then the syntax will be:
Id: This customer’s id
Name: This customer’s name
Email: This customer’s email
You can never pass custom api response types as backend params, but if you break down the call like that it works just fine.