docs: func (s *Message) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "Message"}
  	if s.Body == nil {
  		invalidParams.Add(request.NewErrParamRequired("Body"))
  	}
  	if s.Subject == nil {
  		invalidParams.Add(request.NewErrParamRequired("Subject"))
  	}
  	if s.Body != nil {
  		if err := s.Body.Validate(); err != nil {
  			invalidParams.AddNested("Body", err.(request.ErrInvalidParams))
  		}
  	}
  	if s.Subject != nil {
  		if err := s.Subject.Validate(); err != nil {
  			invalidParams.AddNested("Subject", err.(request.ErrInvalidParams))
  		}
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }