@type t() :: %Inttegro.MessageTemplateVariableInput{
  about: String.t() | nil,
  default: term() | nil,
  items: [Inttegro.MessageTemplateVariableItemInput.t()] | nil,
  name: String.t(),
  required: boolean() | nil,
  type: Inttegro.MessageTemplateVariableType.t()
}