code: func (c *GameLift) DescribeMatchmakingConfigurations(input *DescribeMatchmakingConfigurationsInput) (*DescribeMatchmakingConfigurationsOutput, error) {
  	req, out := c.DescribeMatchmakingConfigurationsRequest(input)
  	return out, req.Send()
  }
docs: // DescribeMatchmakingConfigurations API operation for Amazon GameLift.
  //
  // Retrieves the details of FlexMatch matchmaking configurations. with this
  // operation, you have the following options: (1) retrieve all existing configurations,
  // (2) provide the names of one or more configurations to retrieve, or (3) retrieve
  // all configurations that use a specified rule set name. When requesting multiple
  // items, use the pagination parameters to retrieve results as a set of sequential
  // pages. If successful, a configuration is returned for each requested name.
  // When specifying a list of names, only configurations that currently exist
  // are returned.
  //
  //    * CreateMatchmakingConfiguration
  //
  //    * DescribeMatchmakingConfigurations
  //
  //    * UpdateMatchmakingConfiguration
  //
  //    * DeleteMatchmakingConfiguration
  //
  //    * CreateMatchmakingRuleSet
  //
  //    * DescribeMatchmakingRuleSets
  //
  //    * ValidateMatchmakingRuleSet
  //
  //    * DeleteMatchmakingRuleSet
  //
  // 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 Amazon GameLift's
  // API operation DescribeMatchmakingConfigurations for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidRequestException "InvalidRequestException"
  //   One or more parameter values in the request are invalid. Correct the invalid
  //   parameter values before retrying.
  //
  //   * ErrCodeInternalServiceException "InternalServiceException"
  //   The service encountered an unrecoverable internal failure while processing
  //   the request. Clients can retry such requests immediately or after a waiting
  //   period.
  //
  //   * ErrCodeUnsupportedRegionException "UnsupportedRegionException"
  //   The requested operation is not supported in the region specified.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/gamelift-2015-10-01/DescribeMatchmakingConfigurations