Raised when a payment method is referenced for a customer it is not attached to (e.g., set_default_payment_method/3 with a pm_id that belongs to a different customer).
set_default_payment_method/3
pm_id
@type t() :: %Accrue.Error.NotAttached{ __exception__: true, customer_id: term(), message: term(), payment_method_id: term() }