code: func (c *StorageGateway) ActivateGateway(input *ActivateGatewayInput) (*ActivateGatewayOutput, error) {
  	req, out := c.ActivateGatewayRequest(input)
  	return out, req.Send()
  }
docs: // ActivateGateway API operation for AWS Storage Gateway.
  //
  // Activates the gateway you previously deployed on your host. In the activation
  // process, you specify information such as the region you want to use for storing
  // snapshots or tapes, the time zone for scheduled snapshots the gateway snapshot
  // schedule window, an activation key, and a name for your gateway. The activation
  // process also associates your gateway with your account; for more information,
  // see UpdateGatewayInformation.
  //
  // You must turn on the gateway VM before you can activate your gateway.
  //
  // 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 Storage Gateway's
  // API operation ActivateGateway for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/ActivateGateway