This change adds payment_method and referrals fields to the Customer model and introduces new CustomerReferral and ReferredCustomer types so that expanded query responses include payment method and referral data. By aligning the Python client with the autumn-js interface, it ensures those fields are no longer dropped and improves data completeness. However, documentation wasn’t updated, the payment_method field remains loosely typed as Any, and test coverage for the new referral models may be insufficient.