template/buttons.go
func NewPostbackButton(title string, payload string) Button {
	return Button{
		Type:    ButtonTypePostback,
		Title:   title,
		Payload: payload,
	}
}
func NewPostbackButton(title string, payload string) Button {
	return Button{
		Type:    ButtonTypePostback,
		Title:   title,
		Payload: payload,
	}
}
// NewPostbackButton creates a button used in ButtonTemplate that upon clicking sends a payload request to the server