How to record tips from customers

How to record tips from customers

I run a cleaning service business and on occasion customers include a tip with their check payment. How can I record the amount paid for service and the tip separately? Any amount over the invoice is looked at as an overpayment and suggest a credit note be made. However, this amount is not a credit to be applied to another invoice at a later date. Any help would be greatly appreciated, thank you.
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