Apex Trigger Whenever a Contact is updated (Email / Phone), Salesforce calls external REST API again using Queueable Apex | Salesforce sends Contact data using POST REST API using Queueable Apex

Apex Trigger Whenever a Contact is updated (Email / Phone), Salesforce calls external REST API again using Queueable Apex | Salesforce sends Contact data using POST REST API using Queueable Apex

REAL-TIME BUSINESS SCENARIO (POST + QUEUEABLE)

📌 Scenario

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Salesforce has Contacts not yet synced with an External CRM
Salesforce sends Contact data using POST REST API
External system returns:
- externalCustomerId
Salesforce:
- updates the Contact with External ID
- creates a new Log record (example: Integration Log)
Whenever a Contact is updated (Email / Phone):
- Salesforce calls external REST API again using Queueable Apex

Salesforce Setup

Custom Fields of Contact

External_Customer_Id__c (Text)

Custom Object (optional but real-world)

Integration_Log__c:
- Request__c (Long Text)
- Response__c (Long Text)
- Status__c (Text)

Step 1 Account Trigger (After Update): ContactPracticeTrigger.apxt

  TRIGGER ContactPracticeTrigger ON Contact (BEFORE INSERT, after INSERT, BEFORE UPDATE, after UPDATE) {

```
 
```
```
    IF(TRIGGER.isAfter){
```
```
 
```
```
        IF(TRIGGER.isUpdate){
```
```
 
```

            List<Id> conIds = NEW List<Id>();

```
 
```

            FOR(Contact con:TRIGGER.new){

```
 
```

                Contact oldData =  TRIGGER.oldMap.get(con.Id);

```
 
```

                IF(con.Phone != oldData.Phone || con.Email != oldData.Email){

```
                    conIds.add(con.Id);
```
```
                }
```
```
 
```
```
            }
```
```
 
```
```
            IF(!conIds.isEmpty()){
```

                ContactPracticeQueueable que = NEW ContactPracticeQueueable(conIds);

```
                System.enqueueJob(que);
```

                //System.enqueueJob(NEW ContactPracticeQueueable(conIds));

```
            }
```
```
 
```
```
        }
```
```
 
```
```
    }
```
```
 
```
```
}
```

Step 2 Apex Controller: ContactPracticeQueueable.apxc

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```
 
```

public class ContactPracticeQueueable implements Queueable, DATABASE.AllowsCallouts{

```
 
```
```
    public List<Id> contactIds;
```
```
 
```

    public ContactPracticeQueueable(List<Id> ids){

```
         this.contactIds = ids;
```
```
    }
```
```
 
```

    public void EXECUTE(QueueableContext qc) {

```
 
```

        List<Contact> conObjList = [SELECT Id, FirstName, LastName, Email, Phone, External_Customer_Id__c FROM Contact WHERE Id IN:contactIds];

```
 
```

        List<Contact> conItem = NEW List<Contact>();

        List<Integration_Log__c> logs = NEW List<Integration_Log__c>();

```
 
```
```
 
```
```
        FOR(Contact con:conObjList){
```
```
 
```
```
          Http h = NEW Http();
```

          HttpRequest req = NEW HttpRequest();

          req.setEndpoint('https://reqres.in/api/users'); // Public test API

```
          req.setMethod('POST');
```

          req.setHeader('Content-Type', 'application/json');

          req.setHeader('x-api-key', 'reqres_4d079b1969e2489f803812be427d6bc3');

          //req.setBody('{"fname":con.FirstName, "lname":con.LastName, "email":con.Email, "phone":con.Phone}');

```
 
```

          Map<String, Object> bodyData = NEW Map<String, Object>();

          bodyData.put('fname',con.FirstName);

          bodyData.put('lname',con.LastName);

          bodyData.put('email',con.Email);

          bodyData.put('phone',con.Phone);

          req.setBody(JSON.serialize(bodyData));

```
 
```

         HttpResponse res = h.send(req);

         system.debug('StatusCode ' + res.getStatusCode());

```
 
```

            Integration_Log__c log = NEW Integration_Log__c();

            log.Request__c = req.getBody();

            log.Response__c = res.getBody();

            log.Status__c  = String.valueOf(res.getStatusCode());

```
 
```
```
            logs.add(log);
```
```
 
```

            system.debug('logs##### ' + logs);

```
 
```

        IF(res.getStatusCode() == 200 || res.getStatusCode() == 201){

```
 
```

            Map<String, Object> resData = (Map<String, Object>) json.deserializeUntyped(res.getBody());

            system.debug('resData ' + resData);

```
 
```

            string resId = (String) resData.get('id');

```
 
```

            con.External_Customer_Id__c = resId;

```
            conItem.add(con);
```
```
          }
```
```
 
```
```
        }
```
```
 
```
```
        IF(!conItem.isEmpty()){
```
```
            UPDATE conItem;
```
```
        }
```
```
 
```
```
        IF (!logs.isEmpty()) {
```
```
            INSERT logs;
```
```
        }
```
```
 
```
```
    }
```
```
 
```
```
 
```
```
}
```

Further post that would you like to learn in Salesforce

FAQ (Frequently Asked Questions)

Can we use trigger new in after update?

trigger. new is available only on insert, update, and undelete triggers and represents the new version of the records after the trigger event.

How do you call an external API from Salesforce using Apex?

To call an API from Apex, use a named credential, which specifies the URL of a callout endpoint and its required authentication parameters. By security policy, sessions created by Lightning components aren't enabled for API access. This restriction prevents even your Apex code from making API calls to Salesforce.

What are the limitations of Queueable apex?

Limitations of Queueable Apex: Job Depth Limit: Queueable Apex allows a maximum of 5 chained jobs in a single transaction. Exceeding this limit results in a runtime error. Future Methods do not have this limitation, as they cannot be chained.

Vijay Kumar

Hi, This is Vijay Kumar behind the admin and founder of w3web.net. I am a senior software developer and working in MNC company from more than 8 years. I am great fan of technology, configuration, customization & development. Apart of this, I love to write about Blogging in spare time, Working on Mobile & Web application development, Salesforce lightning, Salesforce LWC and Salesforce Integration development in full time. [Read full bio] | | The Sitemap where you can find all published post on w3web.net

Can we use trigger new in after update?

How do you call an external API from Salesforce using Apex?

What are the limitations of Queueable apex?

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