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_DeleteApnsVoipSandboxChannel.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"
)

// Disables the APNs VoIP sandbox channel for an application and deletes any
// existing settings for the channel.
func (c *Client) DeleteApnsVoipSandboxChannel(ctx context.Context, params *DeleteApnsVoipSandboxChannelInput, optFns ...func(*Options)) (*DeleteApnsVoipSandboxChannelOutput, error) {
	if params == nil {
		params = &DeleteApnsVoipSandboxChannelInput{}
	}

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

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

type DeleteApnsVoipSandboxChannelInput struct {

	// 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 DeleteApnsVoipSandboxChannelOutput struct {

	// Provides information about the status and settings of the APNs (Apple Push
	// Notification service) VoIP sandbox channel for an application.
	//
	// This member is required.
	APNSVoipSandboxChannelResponse *types.APN
    
func (c *Client) addOperationDeleteApnsVoipSandboxChannelMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestjson1_serializeOpDeleteApnsVoipSandboxChannel{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpDeleteApnsVoipSandboxChannel{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DeleteApnsVoipSandboxChannel"); 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 = addOpDeleteApnsVoipSandboxChannelValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDeleteApnsVoipSandboxChannel(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
}