A unique identifier of an object. System sets the id automatically for each customer and subscription.
A non-unique, optional identifier of a customer and subscription. You can provide it in the Billin GUI or with the API. It can be a card number or a club member number. "Your id" can be used to lookup the customers using your own data. You should use it instead of relying on information not always available, like a tax number required by most companies.
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