code: func (c *ConfigService) DescribeRetentionConfigurations(input *DescribeRetentionConfigurationsInput) (*DescribeRetentionConfigurationsOutput, error) {
  	req, out := c.DescribeRetentionConfigurationsRequest(input)
  	return out, req.Send()
  }
docs: // DescribeRetentionConfigurations API operation for AWS Config.
  //
  // Returns the details of one or more retention configurations. If the retention
  // configuration name is not specified, this action returns the details for
  // all the retention configurations for that account.
  //
  // Currently, AWS Config supports only one retention configuration per region
  // in your account.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Config's
  // API operation DescribeRetentionConfigurations for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidParameterValueException "InvalidParameterValueException"
  //   One or more of the specified parameters are invalid. Verify that your parameters
  //   are valid and try again.
  //
  //   * ErrCodeNoSuchRetentionConfigurationException "NoSuchRetentionConfigurationException"
  //   You have specified a retention configuration that does not exist.
  //
  //   * ErrCodeInvalidNextTokenException "InvalidNextTokenException"
  //   The specified next token is invalid. Specify the nextToken string that was
  //   returned in the previous response to get the next page of results.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/config-2014-11-12/DescribeRetentionConfigurations