docs: def retrieve(payment_id):
          """
          Retrieve a payment from its id.
  
          :param payment_id: The payment id
          :type payment_id: string
  
          :return: The payment resource
          :rtype: resources.Payment
          """
          http_client = HttpClient()
          response, __ = http_client.get(routes.url(routes.PAYMENT_RESOURCE, resource_id=payment_id))
          return resources.Payment(**response)