In case of needing information about how to enable refunds, you can find it here:
​ http://help.rentlysoft.com/en/articles/5328253-how-to-enable-the-refund
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1. Select Add Payment/ Multiple Payments
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2. Select the transaction type "Refunded"
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3. Select "Charge"
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4. Once the Refund is done, you are able to see the details at the "Price" updating and leaving the correct balance.
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