You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_UpdateApnsVoipChannel.go
    path of file: ./repos/aws-sdk-go-v2/service/pinpoint
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package pinpoint

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/pinpoint/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Enables the APNs VoIP channel for an application or updates the status and
// settings of the APNs VoIP channel for an application.
func (c *Client) UpdateApnsVoipChannel(ctx context.Context, params *UpdateApnsVoipChannelInput, optFns ...func(*Options)) (*UpdateApnsVoipChannelOutput, error) {
	if params == nil {
		params = &UpdateApnsVoipChannelInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "UpdateApnsVoipChannel", params, optFns, c.addOperationUpdateApnsVoipChannelMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*UpdateApnsVoipChannelOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type UpdateApnsVoipChannelInput struct {

	// Specifies the status and settings of the APNs (Apple Push Notification service)
	// VoIP channel for an application.
	//
	// This member is required.
	APNSVoipChannelRequest *types.APNSVoipChannelRequest

	// The unique identifier for the application. This identifier is displayed as the
	// Project ID on the Amazon Pinpoint console.
	//
	// This member is required.
	ApplicationId *string

	noSmithyDocumentSerde
}

type UpdateApnsVoipChannelOutput struct {

	// Provides i
    
func (c *Client) addOperationUpdateApnsVoipChannelMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestjson1_serializeOpUpdateApnsVoipChannel{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpUpdateApnsVoipChannel{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "UpdateApnsVoipChannel"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpUpdateApnsVoipChannelValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opUpdateApnsVoipChannel(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}