t :: %Easypost.PostageLabel{id: String.t, object: String.t, created_at: String.t, updated_at: String.t, date_advance: number, integrated_form: String.t, label_date: String.t, label_resolution: number, label_size: String.t, label_type: String.t, label_file_type: String.t, label_url: String.t, label_pdf_url: String.t, label_epl2_url: String.t, label_zpl_url: String.t}