@type t() :: %Paypal.Subscription.Subscriber{
  email_address: String.t() | nil,
  name: map() | nil,
  payer_id: String.t() | nil,
  shipping_address: map() | nil
}

Subscriber details:

• email_address - The email address of the subscriber.
• payer_id - The PayPal account ID of the subscriber.
• name - Map containing subscriber given_name and surname.
• shipping_address - Map containing subscriber shipping address.