Two-way CRM synchronization needs an authority rule for every shared field. Start with one object and define how records match. Agree which changes can travel automatically and which conflicts need a decision.
Choose the authority and matching key
Write down which system owns each field and what happens when the other system receives an edit. Use a stable shared identifier or a reviewed mapping. Confirm how merges, deleted records, and records with no match are handled. Keep the first scope narrow enough that operators can review exceptions.
Distinguish a new edit from a reflected update
Where the systems support it, record source event identifiers, versions, or change markers so a write from the integration does not become a fresh change in the reverse direction. Do not rely only on wall-clock order when edits can arrive late. Agree what to do when two changes happen before either side sees the other.
Reconcile conflicts and test replay
Define who can resolve a conflict and what information they need from both records. Test repeated events, simultaneous edits, a missing cross-system identifier, and a destination failure. Verify the actual resulting values after recovery. Keep a reconciled record of what changed and which cases still need review.
Example
Let the CRM own contact details while the service tool owns support tier, with a queue for conflicts.
What to do next
Publish the field authority and conflict rules before allowing two systems to update the same business record.