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Multipass Customer Email field

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I have a question regarding Shopify's Multipass in relation to the email field that will be in the customer information JSON. 

As state in the documentation for Multipass here, by default shopify uses the email address as a unique identifier and we are allow to set our own unique identifier like user id using the "identifier" field.

If I'm are using our own identifiers must I still provide an email address field in the customer information JSON? Is it possible to send this email field as null?

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