Connected does not mean synchronized.
APIs exchange information. Integration design defines ownership, updates and recovery.
Connected does not mean synchronized.
Business integration / decide who owns the record and how failures recover.
Follow the idea
- Identify the source record and the fields it owns.
- Validate, map and handle repeats before changing the target.
- Send failed or conflicting work to an owner for reconciliation.
Keep the limit visible
Conceptual design, not a universal exactly-once guarantee. Interfaces, transaction semantics, ordering and retry behavior differ. Each target operation needs an explicit recovery design.
What if the same event arrives twice?
Use stable event/record identity and an operation-specific strategy so a repeat does not create an unintended duplicate. Some interfaces require reconciliation rather than a blind retry.
“Connecting two systems means their records will stay consistent.”
Ownership, mappings, duplicate handling and recovery need a deliberate design.Source for this graphic: learn.microsoft.com ↗ www.twilio.com ↗ · Checked November 7, 2026 · Illustrative example.
Separate the interface from the event
An API defines how software can request or change information. A webhook notifies another system about an event. A connector or integration platform can implement part of the exchange; it does not decide who owns the underlying record.
A concrete example
Synthetic example: a customer update triggers a notification to an integration. The integration validates the record, maps fields and updates a target system. If a notification is repeated, the design must avoid applying an unintended duplicate action.
Design the awkward path
Choose an authoritative source for each field, stable record identifiers and a reconciliation process. Account for missing fields, interruptions, conflicts and failed updates. Retry behavior must suit the interface and operation; blindly repeating a write can make matters worse.
The next useful question
If two systems disagree—or an event arrives twice—what restores the intended state?
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