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When cloning a journey, a new explicit Webhook Endpoint URL will be generated.

Journeys can be triggered by sending a POST request to the provided Webhook Endpoint URL with the following payload structure:

Param Name	Required	Type	Description
`email`	Yes	String	The email address of the customer
`session_data`	No	JSON Object	Metadata to be attached to the customer's journey session metadata

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The customer must already exist in your site account, which means there must have been a previous interaction, such as a previously identified cart or browse session, being added to a list, etc.
If you want to ensure that every customer used to trigger a webhook journey already exists, you can use the Create Customer Profile endpoint prior to triggering the journey.