Use the Merge Students tool to safely combine duplicate accounts while preserving all attendance and purchase history.
Meta Tags: merge students, duplicate accounts, Karmasoft settings
Merging Duplicate Accounts

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Go to Settings → Merge Students
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Enter the Source account (to remove) and Target account (to keep).
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Review carefully (this cannot be undone).
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Click Merge.
All history (orders, attendance, notes, etc.) moves to the target account.