Choose the source of truth
Assign a reference source for customers, products and orders. Define what synchronises, in which direction and how often. Reliable integration starts with these business rules.
Plan for failure
An API may become unavailable or reject a record. Plan timeouts, controlled retries and duplicate protection. Useful logs help trace an operation without exposing unnecessary sensitive data.
Test real situations
Check deletion, simultaneous updates, missing fields and network interruptions. Ask users to validate results and prepare a rollback procedure before release.