2. Embed Flow Building
Leave all authentications that should be filled out by the end users empty.
In case you want to provide authentication for a connector (e.g. your flow uses the Google Maps Connectors, and you provide your API key for all users), you can fill out the Connector Auth of this Connector and the users will not be accessed to provide authentication for this Connector.
In order to automatically create webhooks for your end users, you have to use the webhook trigger for Connectors feature. This will automatically create a webhook for every end user enabled flow, triggering only their specific flow.