Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Approval Processing
Authentication
Chatter Answers and Ideas
Use Cases for the CommercePayments Namespace
Connect in Apex
Connect in Apex Examples
Get Feed Elements From a Feed
Get Feed Elements From Another User’s Feed
Get Site-Specific Feed Elements from a Feed
Post a Feed Element
Post a Feed Element with a Mention
Post a Feed Element with Existing Files
Post a Rich-Text Feed Element with Inline Image
Post a Rich-Text Feed Element with a Code Block
Post a Feed Element with a New File (Binary) Attachment
Post a Batch of Feed Elements
Post a Batch of Feed Elements with a New (Binary) File
Define an Action Link and Post with a Feed Element
Define an Action Link in a Template and Post with a Feed Element
Edit a Feed Element
Edit a Question Title and Post
Like a Feed Element
Bookmark a Feed Element
Share a Feed Element (prior to Version 39.0)
Share a Feed Element (in Version 39.0 and Later)
Send a Direct Message
Post a Comment
Post a Comment with a Mention
Post a Comment with an Existing File
Post a Comment with a New File
Post a Rich-Text Comment with Inline Image
Post a Rich-Text Feed Comment with a Code Block
Edit a Comment
Follow a Record
Unfollow a Record
Get a Repository
Get Repositories
Get Allowed Item Types
Get Previews
Get a File Preview
Get Repository Folder Items
Get a Repository Folder
Get a Repository File Without Permissions Information
Get a Repository File with Permissions Information
Create a Repository File Without Content (Metadata Only)
Create a Repository File with Content
Update a Repository File Without Content (Metadata Only)
Update a Repository File with Content
Get an Authentication URL
Connect in Apex Features
Using ConnectApi Input and Output Classes
Understanding Limits for ConnectApi Classes
Packaging ConnectApi Classes
Serializing and Deserializing ConnectApi Objects
ConnectApi Versioning and Equality Checking
Casting ConnectApi Objects
Wildcards
Testing ConnectApi Code
Differences Between ConnectApi Classes and Other Apex Classes
Moderate Chatter Private Messages with Triggers
DataWeave in Apex (Developer Preview)
Moderate Feed Items with Triggers
Experience Cloud Sites
Email
External Services
Flows
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
Glossary
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Get an Authentication URL

This example calls getOAuthCredentialAuthUrl(requestBody) to retrieve the URL that a user must visit to begin an authentication flow, ultimately returning authentication tokens to Salesforce. Accepts input parameters representing a specific external credential and, optionally, a named principal. Use this method as part of building a customized or branded user interface to help users initiate authentication. 
1ConnectApi.OAuthCredentialAuthUrlInput input = new ConnectApi.OAuthCredentialAuthUrlInput();
2
3input.externalCredential = 'MyExternalCredentialDeveloperName';
4input.principalType = ConnectApi.CredentialPrincipalType.PerUserPrincipal;
5input.principalName = 'MyPrincipal'; // Only required when principalType = NamedPrincipal
6
7ConnectApi.OAuthCredentialAuthUrl output = ConnectApi.NamedCredentials.getOAuthCredentialAuthUrl(input);
8
9String authenticationUrl = output.authenticationUrl; // Redirect users to this URL to authenticate in the browser