A Safe Duplicate Customer Account Merge Workflow
Published September 4, 2026.
Duplicate accounts can split orders, preferences, and loyalty history. A careless merge can also expose one person's information to another, so similarity is not enough evidence.
Establish authority and scope
Use the client's approved verification path for both records. Compare stable identifiers, creation history, linked orders, authentication state, and risk flags. Do not tell a customer details from the second record merely to test whether they recognize them.
List conflicts before requesting approval: primary email, phone, address, consent state, stored payment reference, rewards balance, and open cases. Name which system owns each field and what will survive the merge.
Confirm the finished record
The authorized owner should approve sensitive merges. After the action, verify access, order history, preferences, active cases, and audit events. Send a confirmation that describes the result without exposing hidden account data.
If verification fails, preserve separate records and use the approved recovery route. Review merge cases for false matches, missing history, consent changes, login failure, and reversals. The safest metric is not merge volume. It is the proportion completed without privacy or continuity defects.