```ruby
module Fix
  module Protocol
    module Messages

      #
      # A FIX logon message
      #
      class Logon < Message

        unordered :body do
          field :encrypt_method,      tag: 98,  required: true, type: :integer, default: 0
          field :heart_bt_int,        tag: 108, required: true, type: :integer, default: 30
          field :username,            tag: 553, required: true
          field :reset_seq_num_flag,  tag: 141,                 type: :yn_bool, default: false
        end

        #
        # Returns the logon-specific errors
        #
        # @return [Array] The error messages
        #
        def errors
          e = []
          e << "Encryption is not supported, the transport level should handle it" unless (encrypt_method == 0)
          e << "Heartbeat interval should be between 10 and 60 seconds"            unless heart_bt_int && heart_bt_int <= 60 && heart_bt_int >= 10
          [super, e].flatten
        end

      end
    end
  end
end

```

Add password field to Logon message
user
```ruby
module Fix
  module Protocol
    module Messages

      #
      # A FIX logon message
      #
      class Logon < Message

        unordered :body do
          field :encrypt_method,      tag: 98,  required: true, type: :integer, default: 0
          field :heart_bt_int,        tag: 108, required: true, type: :integer, default: 30
          field :username,            tag: 553, required: true
          field :password,            tag: 554, required: true
          field :reset_seq_num_flag,  tag: 141,                 type: :yn_bool, default: false
        end

        #
        # Returns the logon-specific errors
        #
        # @return [Array] The error messages
        #
        def errors
          e = []
          e << "Encryption is not supported, the transport level should handle it" unless (encrypt_method == 0)
          e << "Heartbeat interval should be between 10 and 60 seconds"            unless heart_bt_int && heart_bt_int <= 60 && heart_bt_int >= 10
          [super, e].flatten
        end

      end
    end
  end
end
```
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