17.15Failure question

Interviewer asks:

“What happens if Loyalty is down?”

Don't immediately answer.

Ask:

“Is Loyalty mandatory for the customer profile?”

If no:

Salesforce success
Billing success
Loyalty fails

maybe return:

{
  "customerId": "C001",
  "name": "Acme",
  "balance": 1200,
  "loyalty": null,
  "warnings": [
    "Loyalty information temporarily unavailable"
  ]
}

If mandatory:

propagate failure