docs: func (s *CreateApiMappingInput) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "CreateApiMappingInput"}
  	if s.ApiId == nil {
  		invalidParams.Add(request.NewErrParamRequired("ApiId"))
  	}
  	if s.DomainName == nil {
  		invalidParams.Add(request.NewErrParamRequired("DomainName"))
  	}
  	if s.DomainName != nil && len(*s.DomainName) < 1 {
  		invalidParams.Add(request.NewErrParamMinLen("DomainName", 1))
  	}
  	if s.Stage == nil {
  		invalidParams.Add(request.NewErrParamRequired("Stage"))
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }