@type t() :: %PolarExpress.Schemas.CustomerSubscriptionCancel{
  cancel_at_period_end: boolean() | nil,
  cancellation_comment: String.t() | nil,
  cancellation_reason: PolarExpress.Schemas.CustomerCancellationReason.t() | nil
}

• cancel_at_period_end - Cancel an active subscription once the current period ends.

Or uncancel a subscription currently set to be revoked at period end. Nullable.

• cancellation_comment - Customer feedback and why they decided to cancel. Nullable.

• cancellation_reason - Customers reason for cancellation.

• too_expensive: Too expensive for the customer.

• missing_features: Customer is missing certain features.

• switched_service: Customer switched to another service.

• unused: Customer is not using it enough.

• customer_service: Customer is not satisfied with the customer service.

• low_quality: Customer is unhappy with the quality.

• too_complex: Customer considers the service too complicated.

• other: Other reason(s). Nullable.