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9.3System API

A System API wraps a backend system.

Examples:

Salesforce System API
SAP System API
Billing System API
Customer DB System API

Its job is to hide backend-specific details.

For Salesforce:

Consumer
   ↓
Salesforce System API
   ↓
Salesforce Connector
   ↓
Salesforce

Instead of making every other Mule application know:

SOQL
Account
Contact
__c fields
Salesforce IDs
OAuth details
Salesforce error formats

the System API exposes a cleaner internal contract.