anchor.diff:  
   * It has a constructor as shown above.
   
  -* A field called `greeting` is defined. This is a custom field. It has a corresponding `getGreeting` method.
  +* A field called `newInvoiceMessage` is defined. This is a custom field. It has a corresponding `getNewInvoiceMessage` method.
   
   * You can add other custom fields as required. For each field, ensure that the field is initialized and that there is a `getter` method that returns the value of the field. 
   
  
positive.code: 
  For example, in order to include the `greeting` field created earlier  in the invoice creation email, you will need to do the following:
  
  * Create an email template with the  `invoice.greeting` field as shown below and upload the new template as explained https://docs.killbill.io/latest/email-notification-plugin.html#_uploading_a_custom_template[here].
  [source,bash]
  {{invoice.greeting}}
  
  * Trigger the invoice creation email as explained https://docs.killbill.io/latest/email-notification-plugin.html#_testing_the_plugin[here].
  
  
negative.code: 	
  	private static final Logger logger = LoggerFactory.getLogger(CustomInvoiceFormatter.class);
  	
      private String newInvoiceMessage="Here is your new invoice!!";
  	
  	public String getNewInvoiceMessage() {
  		return newInvoiceMessage;
  	}
  
  }
  