public class SellerComplianceBatch implements Database.Batchable<sObject>, Database.Stateful { public Integer errorCount = 0; public List<Id> failedIds = new List<Id>(); public Database.QueryLocator start(Database.BatchableContext bc) { // Selective SOQL — index on RecordType + IsActive reduces scan return Database.getQueryLocator( 'SELECT Id, Seller_Status__c, GST_Verified__c, KYC_Status__c ' + 'FROM Account WHERE RecordType.Name = \'Seller\' AND IsActive__c = true' ); } public void execute(Database.BatchableContext bc, List<Account> scope) { for(Account a : scope) { a.Seller_Status__c = SellerComplianceHelper.evaluate(a); } List<Database.SaveResult> results = Database.update(scope, false); for(Integer i = 0; i < results.size(); i++) { if(!results[i].isSuccess()) { errorCount++; failedIds.add(scope[i].Id); } } } public void finish(Database.BatchableContext bc) { Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage(); mail.setPlainTextBody('Batch complete. Errors: ' + errorCount); Messaging.sendEmail(new Messaging.SingleEmailMessage[]{mail}); } } // Schedule for 2 AM IST System.schedule('Seller Compliance', '0 0 2 * * ?', new SellerComplianceBatch());

// Step 1: Send welcome email, then enqueue Step 2 public class SellerOnboardingStep1 implements Queueable { private Id sellerId; public SellerOnboardingStep1(Id sellerId) { this.sellerId = sellerId; } public void execute(QueueableContext ctx) { // Step 1: Send welcome email SellerEmailHelper.sendWelcomeEmail(sellerId); // Chain to Step 2 System.enqueueJob(new SellerOnboardingStep2(sellerId)); } } // Step 2: Create SRM Task, then enqueue Step 3 public class SellerOnboardingStep2 implements Queueable { private Id sellerId; public SellerOnboardingStep2(Id sellerId) { this.sellerId = sellerId; } public void execute(QueueableContext ctx) { // Step 2: Create onboarding Task for SRM insert new Task(WhatId=sellerId, Subject='Seller Onboarding Call', Status='Not Started'); System.enqueueJob(new SellerOnboardingStep3(sellerId)); } } // Step 3: External API call to provision seller access public class SellerOnboardingStep3 implements Queueable, Database.AllowsCallouts { private Id sellerId; public SellerOnboardingStep3(Id sellerId) { this.sellerId = sellerId; } public void execute(QueueableContext ctx) { // Step 3: Provision seller in Flipkart internal system Http h = new Http(); HttpRequest req = new HttpRequest(); req.setEndpoint('callout:Flipkart_Internal_API/v1/sellers/provision'); req.setMethod('POST'); req.setBody('{"sellerId":"' + sellerId + '"}'); HttpResponse res = h.send(req); if(res.getStatusCode() == 200) { System.enqueueJob(new SellerOnboardingStep4(sellerId)); } else { // Log error — don't chain Step 4 insert new Error_Log__c(Record_Id__c=sellerId, Error__c=res.getBody()); } } }

// Secure callout — no credentials in code public class GSTVerificationService { public static Boolean verifyGST(String gstNumber) { Http h = new Http(); HttpRequest req = new HttpRequest(); // Named Credential handles OAuth token automatically req.setEndpoint('callout:Flipkart_GST_API/v1/gst/validate?gst=' + gstNumber); req.setMethod('GET'); req.setTimeout(10000); // 10 second timeout HttpResponse res = h.send(req); if(res.getStatusCode() == 200) { Map<String,Object> body = (Map<String,Object>)JSON.deserializeUntyped(res.getBody()); return (Boolean)body.get('isValid'); } return false; // Default to false on error } } // In test class — NEVER calls real API @isTest public class GSTVerificationTest { @isTest static void testVerifyGST() { Test.setMock(HttpCalloutMock.class, new GSTMockCallout()); Test.startTest(); Boolean result = GSTVerificationService.verifyGST('27AABCU9603R1ZX'); Test.stopTest(); System.assertEquals(true, result); } }

// ONE trigger per object — no logic here trigger AccountTrigger on Account ( before insert, before update, after insert, after update, after delete ) { // Check bypass Custom Metadata first if(TriggerBypassHandler.isBypassed('Account')) return; AccountTriggerHandler handler = new AccountTriggerHandler(); if(Trigger.isBefore) { if(Trigger.isInsert) handler.beforeInsert(Trigger.new); if(Trigger.isUpdate) handler.beforeUpdate(Trigger.new, Trigger.oldMap); } if(Trigger.isAfter) { if(Trigger.isInsert) handler.afterInsert(Trigger.new); if(Trigger.isUpdate) handler.afterUpdate(Trigger.new, Trigger.oldMap); } } // Bypass check via Custom Metadata public class TriggerBypassHandler { private static Map<String,Boolean> bypassCache; public static Boolean isBypassed(String objectName) { if(bypassCache == null) { bypassCache = new Map<String,Boolean>(); for(Trigger_Settings__mdt ts : [ SELECT Object_Name__c, Is_Active__c FROM Trigger_Settings__mdt ]) { bypassCache.put(ts.Object_Name__c, !ts.Is_Active__c); } } return bypassCache.containsKey(objectName) && bypassCache.get(objectName); } }