Send Custom Notification using Lightning Flow

As we know that custom notification can be send using process builder. Process builder will not work in below cases.

1. To send a notification to admin about the batch class completion without sending e-mail
2. To build some complex notification delivery using trigger.
3. To send notification when APEX API is successfully executed.

We will build the use case to send notification to the Submitter when the batch job is complete

Step 1: Create a Auto Launch flow from flow builder and drag the action on the canvas.

Step 2: Configure the action by choosing the Notification Category as mentioned in below screenshot.

Step 3: Configure the input variables for each required value. Make sure that for the Recipient Id the variable type should of string collection.

Step 4: Create a Batch Class as below to send notification once batch class is successfully completed.

public with sharing class BatchLeadConvert implements Database.Batchable<SObject>{
    
    private final String CONVERTED_STATUS = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1].MasterLabel;
    
    public Database.QueryLocator start(Database.BatchableContext ctx){
        return Database.getQueryLocator([SELECT Id FROM Lead WHERE ConvertedContactId = null]);
    }
    
    public void execute(Database.BatchableContext ctx, List<Lead> records){
        //Execute any business Logic
    }
    
    public void finish(Database.BatchableContext ctx){
        Map<String, Object> myMap = new Map<String, Object>();
        
        List<String> reciepientIds = new List<String>();
        
        AsyncApexJob a = [SELECT Id, Status, NumberOfErrors, JobItemsProcessed,TotalJobItems, CreatedBy.Id FROM AsyncApexJob WHERE Id =:ctx.getJobId()];
        reciepientIds.add(a.CreatedBy.Id);
        myMap.put('notificationId', '0ML6F000000k9eCWAQ');// Id of your custom notification. You can store this in custom label.
        myMap.put('notificationBody', 'Batch class BatchLeadConvert is completed');
        myMap.put('targetId', a.CreatedBy.Id);// target id can be of any type but here i am using the user id of the batch submitted by
        myMap.put('NotificationTitle', 'Batch Class is Completed');
        myMap.put('recipientIds',reciepientIds); // list of recipeint Ids;
        
        Flow.Interview.Notification_Flow myFlow = new Flow.Interview.Notification_Flow(myMap); //Notification_Flow is name of your flow
        myFlow.start();
    }
}

Step 5: Once the batch class is completed a notification will be displayed in to bell icon.