In the payment screen of PoS interface, after selecting configured payment
method a popup requests loyalty card code:


.. image:: ../static/img/usage_1_code_popup.png
   :width: 300
   :alt: config

After entering card code, a new popup asks user to introduce amount to redeem:

.. image:: ../static/img/usage_2_amount_popup.png
   :width: 300
   :alt: config

A new payment line is added with selected amount:

.. image:: ../static/img/usage_3_payment_line.png
   :width: 300
   :alt: config

After order is completed, loyalty card report is downloaded with updated
points.
