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How to return and refund products?
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To refund a customer, from the PoS main view, you have to insert
negative values. For instance in the last order you count too many
``pumpkins`` and you have to pay back one.

.. image:: media/refund01.png
    :align: center

You can see that the total is negative, to end the refund, you only have
to process the payment.

.. image:: media/refund02.png
    :align: center

.. seealso::
    * :doc:`cash_control`
    * :doc:`invoice`
    * :doc:`seasonal_discount`