Description
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Manages (inserts, updates, or removes) a customer's loyalty tier information. This method serves as a single interface for all changes to a customer's loyalty status. The specific action (insert, update, or remove) is determined by the current state of the merchant-to-customer association and the `loyalty_tier` value provided in the request. **Operation Logic:** * **Upsert (Insert/Update):** Providing any valid tier other than `NON_MEMBER` will associate the customer with that tier. If an association already exists, it will be updated; otherwise, a new one will be created. * **Removal:** Setting `loyalty_tier` to `NON_MEMBER` will remove any existing loyalty association for the customer. **Privacy Note:** To protect user privacy, this method consistently returns a `200 OK` status with a default `LoyaltyCustomer` response if the customer's identifier cannot be matched to a Google account or if the user has not opted into loyalty personalization.