14.65Interview scenario: idempotency

How would you prove the integration is idempotent?

Answer:

“I'd submit the same business request repeatedly—including concurrently—then query Salesforce by the stable External ID. I'd verify there's exactly one record, that its ID remains unchanged, and that its final field state is correct. I'd also inspect other non-idempotent side effects such as events or notifications rather than checking only Salesforce.”

Excellent.