def valid?
      return false if @payment_id.nil?
      return false if @type.nil?
      type_validator = EnumAttributeValidator.new('String', ["FULL", "PARTIAL"])
      return false unless type_validator.valid?(@type)
      return false if @reason.nil?
      return true
    end
def valid?
      return false if @payment_id.nil?
      return false if @type.nil?
      type_validator = EnumAttributeValidator.new('String', ["FULL", "PARTIAL"])
      return false unless type_validator.valid?(@type)
      return false if @reason.nil?
      return true
    end
Check to see if the all the properties in the model are valid
 @return true if the model is valid