def get_capabilities():
    """ Returns a capabilities dictionary, where the keys are the strings
        below and its values are Capability instances

        * item_code           (str)
        * item_id             (int)
        * items_quantity      (float)
        * item_price          (float)
        * item_description    (str)
        * payment_value       (float)
        * payment_description (str)
        * promotional_message (str)
        * customer_name       (str)
        * customer_id         (str)
        * customer_address    (str)
        * add_cash_value      (float)
        * remove_cash_value   (float)
        """
