A production integration is a data contract with failure handling. The happy path is the easy part. Reliability comes from deciding what a record means, who can change it, and how the system recovers when a request is late or duplicated.
Define ownership and identity
For each field, name the source of truth, permitted direction, format, and owner. Use stable external IDs and an explicit mapping table instead of matching records by a mutable name or email alone.
Write down what happens when two systems disagree. Silent overwrites are not reconciliation; they are delayed incidents.
Make every request safe to repeat
Use idempotency keys, bounded retries with backoff, timeouts, dead-letter handling, and structured logs. Separate transient transport failures from validation or permission failures so the response is actionable.
Validate at the boundary and protect credentials with least privilege. Do not pass more personal or commercial data between systems than the workflow needs.
Reconcile, monitor, and rehearse
Run scheduled comparisons for records and totals that should agree. Alert on age, volume, failure rate, and unusual drift rather than waiting for a person to notice a missing customer.
Test duplicate events, partial outages, expired tokens, schema changes, and replay. An integration is operational software and needs a runbook, owner, and recovery path.
Safe integrations are designed around ownership, repeatability, and recovery. When the contract is explicit, the systems can move data quickly without turning every exception into a manual investigation.
What is the most important part of a CRM and ERP integration?
A clear data contract. Define identifiers, field ownership, allowed states, validation, error behaviour, and reconciliation before choosing the transport or middleware.
Should an integration retry every failed request?
No. Retry transient failures with limits and backoff. Validation, authentication, permission, and conflict failures usually need correction or review rather than repetition.
How do you test an integration?
Test normal events, duplicates, out-of-order events, timeouts, rate limits, expired credentials, malformed data, partial outages, replay, and reconciliation against known fixtures.
Turn the research into a working plan.
Bring the evidence, constraints, and next decision. We will help you turn it into a clear technical brief.