An API change can be technically valid in the provider and still break a consumer that depends on an old field or timing rule. An API version can remain technically available while a consumer quietly depends on an old field meaning. A staged migration needs an inventory of consumers and a way to observe real use. Give each consumer a test window and an owner before retiring an old contract.
What good engineering looks like
Which consumers use the current contract, and how will each prove it is ready for the next version? Answer this for a named workflow and an accountable team. Identify the information needed at the moment of decision, the system that can settle a dispute, and the route for correcting dependent copies. The technical design should make those business rules visible to the people who operate and support the handoff.
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Inventory consumers and document the incompatible change.
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Run both contracts through a defined migration window and test representative traffic.
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Retire the old version only after owners verify usage and recovery.
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A named owner for a rejected, delayed or repeated item.
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Evidence that the receiving system applied the intended business state.
A practical starting point
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Choose one real case and write down its trigger, expected outcome and responsible team.
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Run old and new consumers against representative records, including missing fields and error responses.
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Compare outcomes, then check production usage before removing the earlier version. A passing schema test does not prove that a business decision still has the same meaning.
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Record what the test exposed, who will resolve each open question and how the fix will be checked.
Keep the first design small enough to review with the people who run the process. Test an exception alongside the normal case. A successful transport test shows that data moved; it does not by itself prove that the receiving team can make the right decision or recover from a partial failure.
The decision to make
A version number alone does not provide compatibility. Treat behaviour and field meaning as part of the contract. Decide what level of timing, traceability and recovery this workflow actually needs. Document assumptions that remain untested and revisit the choice when a partner, process or business rule changes. The point is a dependable operating decision, not simply a working interface.
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