Apex Developer Guide

Apex Developer Guide
Release Notes
Getting Started with Apex
Writing Apex
Running Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Apex Cursors (Beta)
Approval Processing
Authentication
Chatter Answers and Ideas
Use Cases for the CommercePayments Namespace
Connect in Apex
Moderate Chatter Private Messages with Triggers
Data Cloud In Apex
DataWeave in Apex
Moderate Feed Items with Triggers
Experience Cloud Sites
Email
External Services
Flows
Formula Evaluation in Apex
Metadata
Permission Set Groups
Platform Cache
Salesforce Knowledge
Salesforce Files
Salesforce Connect
Salesforce Reports and Dashboards API via Apex
Salesforce Sites
Support Classes
Territory Management 2.0
Integration and Apex Utilities
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
PDF

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External Services

External Services connect your Salesforce org to a service outside of Salesforce, such as an employee banking service. After you register the external service, you can call it natively in your Apex code. Objects and operations defined in the external service's registered API specification become Apex classes and methods in the ExternalService namespace. The registered service's schema types map to Apex types, and are strongly typed, making the Apex compiler do the heavy lifting for you. For example, you can make a type safe callout to an external service from Apex without needing to use the Http class or perform transforms on JSON strings.