Trying to use the webhook component, but it is limiting me to only 5 parameters, is this intentional or a bug.
Are you on a free or Pro plan?
Pro, I had to refresh the page for it to scroll further to show the add button, it’s ok now. But unable to create a webhook in the Actions designer, I have to create first has a standalone 
Yes this is a bug, you need to create it has a standalone and next use it in the action designer
Been trying to find a reference to this, but I can’t. So, I don’t know.
But… assuming there is a limit then you could work around this by using a template column to concatenate multiple parameters, and then unwind them at the other end.