A MuleSoft integration can work perfectly during development and still behave unexpectedly in production.
The reason is simple: production systems are messy.
Connections drop. External applications respond slowly. Clients retry requests. Workers restart. A downstream system may complete an operation even though Mule never receives the response.
That is when a seemingly harmless retry can become a duplicate order, duplicate invoice, repeated employee record, or—worse—a duplicate payment.
Reliable integrations therefore need to answer two very different questions:
