REST API Developer Guide

REST API
Quick Start
Examples
Getting Information About My Organization
Working with Object Metadata
Working with Records
Delete Lightning Experience Event Series
Working with Searches and Queries
Get an Image from a Rich Text Area Field
Insert or Update Blob Data
Retrieve Blob Data
Working with Recently Viewed Information
Managing User Passwords
Working with Approval Processes and Process Rules
Using Event Monitoring
Using Composite Resources
Execute Dependent Requests in a Single API Call
Update an Account, Create a Contact, and Link Them with a Junction Object
Update a Record and Get Its Field Values in a Single Request
Upsert an Account and Create a Contact
Create Nested Records
Create Multiple Records
Using a Composite Graph
Generating an OpenAPI 3.0 Specification for sObjects REST API (Beta)
Reference
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Upsert an Account and Create a Contact

The following example uses the Composite resource to upsert an account and create a contact that is linked to the account. All these requests are executed in a single call. The composite.json file contains the composite request and subrequest data.
Upsert an account and create a contact
Request body composite.json file
Response body after successfully executing the composite request