What happens when an event arrives for a non-existing customer in Custobar?

List of accepted customer data in events

{
    'email': 'email',
    'phone_number': 'phone_number',
    'first_name': 'first_name',
    'last_name': 'last_name',
    'street_address': 'street_address',
    'zip_code': 'zip_code',
    'city': 'city',
    'country': 'country',
    'shop_id': 'shop_id',
    'customer_company': 'company',
    'customer_can_email': 'can_email',
    'customer_can_sms': 'can_sms',
    'customer_language': 'language'
}