Required: Type of the payment method. One of: "unknown" | "debit" | "credit" | "prepaid" | "store".
Optional
networkOptional: The payment network used, when available. Matches the underlying platform's network identifier (e.g., "visa", "masterCard", etc.). Do not rely on presence for business logic; it may be null.
Optional
displayOptional: Display name of the instrument (e.g., the card's masked label), when available.