unique identifier access key. each brand has it own unique key.
customer identifier. search priority: 1) code, 2) id
DRAFT, PENDING, APPROVED, BLOCKED, INACTIVE custom fields to be set to the customer
customer contacts to be updated. each contact must have a name and at least email or phone. duplicate emails or phones are not allowed. if provided as array, all existing contacts will be replaced. if provided as null or empty array, all contacts will be removed