10.4Asynchronous integration

Instead:

Client
  ↓
POST /customers
  ↓
Mule validates request
  ↓
Queue / Event
  ↓
202 Accepted

Then separately:

Queue
 ↓
Mule worker
 ↓
Salesforce
 ↓
Billing
 ↓
ERP

The client does not wait for the downstream work.