8.2A typical configuration layout

Conceptually:

src/main/resources/

    config-dev.yaml
    config-qa.yaml
    config-prod.yaml

Example:

salesforce:
  instanceUrl: "https://test.salesforce.com"

billing:
  host: "billing-qa.company.com"
  port: "443"

api:
  port: "8081"

Production:

salesforce:
  instanceUrl: "https://login.salesforce.com"

billing:
  host: "billing.company.com"
  port: "443"

api:
  port: "8081"

Same Mule application.

Different configuration.