A unique identifier for the person. This is usually the user id generated when an account is created with your product or service. If such an id doesn't exist, set this to an email address, instead.

The person's email address. This field is optional, but recommended when creating a new person in your Customer.io account.

Add any attributes which would be useful. e.g. Name: John Doe.

The name of the anonymous event you want to track. Learn about anonymous events [here](https://customer.io/docs/anonymous-events/).

The unique id the event will be stored against. Learn more [here](https://customer.io/docs/anonymous-events/#api-anonymous-events).

Any related information you’d like to attach to this anonymous event.

Any related information you’d like to attach to this event.

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