code: def _get_integration_function_name(self, method_config):
          
          if not isinstance(method_config, dict) or self._INTEGRATION_KEY not in method_config:
              return None
  
          integration = method_config[self._INTEGRATION_KEY]
  
          if integration \
                  and isinstance(integration, dict) \
                  and integration.get("type") == IntegrationType.aws_proxy.value:
              # Integration must be "aws_proxy" otherwise we don't care about it
              return LambdaUri.get_function_name(integration.get("uri"))
docs: Tries to parse the Lambda Function name from the Integration defined in the method configuration.
          Integration configuration is defined under the special "x-amazon-apigateway-integration" key. We care only
          about Lambda integrations, which are of type aws_proxy, and ignore the rest. Integration URI is complex and
          hard to parse. Hence we do our best to extract function name out of integration URI. If not possible, we
          return None.
  
          Parameters
          ----------
          method_config : dict
              Dictionary containing the method configuration which might contain integration settings
  
          Returns
          -------
          string or None
              Lambda function name, if possible. None, if not.