docs: def create_single_payment(self, order_number, order_description, order_items, amount, return_url, contact=None, currency=None, lang=None, additional_params=None):
          """
          Create a single payment.
  
          Args:
              contact: JSON describing a payer (see PaymentManager#create_contact)
              order_number: your identifier to the order which the payment is for
              order_description: desription of the order which is show to the
                  user
              order_items: items in order which are shown to the other
                  (item name -> amount)
              amount: total amount of money which will be paid
              returl_url: url for rediraction after payment is processed
              currency: default is set in settings (GOPAY_CURRENCY)
              lang: default is set in settings (GOPAY_LANG)
          Returns:
              dict: payment status
          """
          return self.create_payment(contact, {
              'amount': amount,
              'currency': currency if currency is not None else settings.GOPAY_CURRENCY,
              'lang': lang if lang is not None else settings.GOPAY_LANG,
              'additional_params': [] if additional_params is None else [{'name': key, 'value': str(value)} for key, value in additional_params.items()],
              'order_number': str(order_number),
              'order_description': order_description,
              'items': [{'name': key, 'amount': value} for key, value in order_items.items()],
              'callback': {
                  'return_url': return_url,
                  'notification_url': '{}{}'.format(settings.GOPAY_DOMAIN, reverse('gopay_notify')),
              },
          })