Curriculum
Callouts are one of the most important integration features in Salesforce because they allow Salesforce to communicate with external systems and services in real time. Understanding Callouts helps Salesforce developers retrieve information from external APIs, send data to third-party applications, connect cloud services, and build enterprise-grade integrations.
A Callout is an HTTP request made from Salesforce to an external system. Using Callouts, Salesforce can communicate with payment gateways, ERP systems, websites, cloud services, mobile applications, AI platforms, and other external systems.
Mastering Callouts is essential for modern Salesforce Integration because most enterprise applications depend on external services and APIs.
Callouts are requests sent from Salesforce to external systems using HTTP or HTTPS protocols.
Callouts allow Salesforce to:
Callouts enable real-time communication.
Without Callouts:
Salesforce
×
External System
↓
No CommunicationWith Callouts:
Salesforce
↓
HTTP Callout
↓
External System
↓
Response ReturnedThis enables system integration.
Exchange data instantly.
Connect third-party services.
Reduce manual work.
Support business applications.
Automate workflows.
These benefits make Callouts valuable.
Callouts follow a simple process.
Salesforce
↓
HTTP Request
↓
External API
↓
HTTP Response
↓
SalesforceThis is the foundation of Salesforce integrations.
Salesforce supports:
Both are commonly used.
REST Callouts communicate with REST APIs.
Data format:
JSONREST Callouts are lightweight and widely used.
SOAP Callouts communicate with SOAP web services.
Data format:
XMLSOAP Callouts are common in enterprise environments.
Salesforce
↓
Callout
↓
External Service
↓
Response
↓
Business LogicThis architecture supports real-time integrations.
A Callout typically includes:
Each component is important.
An Endpoint is the destination URL.
Example:
https://api.company.comRequests are sent to endpoints.
Callouts commonly use:
Retrieve information.
Create data.
Update data.
Remove data.
These methods support CRUD operations.
Used to retrieve information.
Example:
Get Student InformationThe external API returns data.
Used to send information.
Example:
Create Registration RecordData is submitted to the external service.
Salesforce provides:
Httpand
HttpRequestclasses for Callouts.
Example:
HttpRequest req =
new HttpRequest();The request object is created.
Example:
req.setEndpoint(
'https://api.company.com'
);The target system is specified.
Example:
req.setMethod(
'GET'
);The action is defined.
Example:
Http http =
new Http();
HttpResponse res =
http.send(req);The request is sent.
Example:
String body =
res.getBody();The returned data is stored.
HttpRequest req =
new HttpRequest();
req.setEndpoint(
'https://api.company.com'
);
req.setMethod(
'GET'
);
Http http =
new Http();
HttpResponse res =
http.send(req);This retrieves external information.
Example:
req.setMethod(
'POST'
);A POST request sends data.
Example:
req.setBody(
'{"name":"Rahul"}'
);JSON data is transmitted.
Workflow:
Callout
↓
JSON Response
↓
JSON Parsing
↓
Apex ObjectsThis is a common integration pattern.
Most integrations follow:
Salesforce
↓
REST Callout
↓
External API
↓
JSON ResponseREST APIs are widely used.
SOAP integrations follow:
Salesforce
↓
SOAP Callout
↓
XML ResponseSOAP remains important in enterprise systems.
Salesforce blocks unknown external endpoints.
Developers must authorize endpoints.
Example:
Remote Site SettingsThis improves security.
Endpoint Added
↓
Authorized
↓
Callout AllowedThe external service becomes accessible.
Named Credentials simplify authentication and endpoint management.
Benefits:
Named Credentials are recommended.
Named Credential
↓
Endpoint
↓
Authentication
↓
CalloutConfiguration becomes simpler.
Common methods include:
Authentication protects data.
req.setHeader(
'Authorization',
'Bearer Token'
);The request becomes authenticated.
Salesforce enforces governor limits.
Example:
Maximum Callouts Per TransactionDevelopers must design efficiently.
Long-running integrations use:
These approaches improve performance.
@future(callout=true)The callout executes asynchronously.
Common issues:
Developers should handle these scenarios.
if(
res.getStatusCode()
== 200
)
{
}The response status is validated.
A training institute portal retrieves course information.
Workflow:
Salesforce
↓
Callout
↓
Course API
↓
Course Data ReturnedInformation is synchronized automatically.
Workflow:
Salesforce
↓
Callout
↓
Payment Gateway
↓
Payment StatusPayments are verified in real time.
Workflow:
Salesforce
↓
Callout
↓
AI Service
↓
Prediction ReturnedModern applications often use this pattern.
A software training institute application communicates with:
Callouts enable data exchange between all systems.
These practices improve reliability.
Developers should avoid these issues.
These advantages make Callouts essential.
Understanding Callouts helps professionals:
Callouts are a core Salesforce Integration skill.
Callouts enable Salesforce to communicate with external systems using HTTP requests and responses. Through REST APIs, SOAP APIs, authentication mechanisms, JSON processing, Named Credentials, and Apex integration, developers can build powerful enterprise integrations. Mastering Callouts is essential for connecting Salesforce with external applications, cloud services, payment gateways, and modern business platforms.
Callouts are HTTP requests sent from Salesforce to external systems.
They enable Salesforce to communicate with APIs and third-party services.
HTTP and HTTPS are commonly used.
Http, HttpRequest, and HttpResponse classes.
Named Credentials simplify endpoint management and authentication.
Callouts are essential for building integrations with external systems.
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