Unmarshal json into struct

unmarshal.go

package main

import (
	"encoding/json"
	"fmt"
	"time"
)

type SnsMessage struct {
	Type             string    `json:type`
	MessageID        string    `json:MessageId`
	Token            string    `json:Token`
	Message          string    `json:Message`
	SubscribeURL     string    `json:SubscribeURL`
	Timestamp        time.Time `json:Timestamp`
	SignatureVersion string    `json:Signature`
	Signature        string    `json:SignatureVersion`
	SigningCertURL   string    `json:SignatureVersion`
}

func main() {

	body := []byte(`{
		"Type" : "SubscriptionConfirmation",
		"MessageId" : "165545c9-2a5c-472c-8df2-7ff2be2b3b1b",
		"Token" : "2336412f37fb687f5d51e6e241d09c805a5a57b30d712f794cc5f6a988666d92768dd60a747ba6f3beb71854e285d6ad02428b09ceece29417f1f02d609c582afbacc99c583a916b9981dd2728f4ae6fdb82efd087cc3b7849e05798d2d2785c03b0879594eeac82c01f235d0e717736",
		"TopicArn" : "arn:aws:sns:us-west-2:123456789012:MyTopic",
		"Message" : "You have chosen to subscribe to the topic arn:aws:sns:us-west-2:123456789012:MyTopic.\nTo confirm the subscription, visit the SubscribeURL included in this message.",
		"SubscribeURL" : "https://sns.us-west-2.amazonaws.com/?Action=ConfirmSubscription&TopicArn=arn:aws:sns:us-west-2:123456789012:MyTopic&Token=2336412f37fb687f5d51e6e241d09c805a5a57b30d712f794cc5f6a988666d92768dd60a747ba6f3beb71854e285d6ad02428b09ceece29417f1f02d609c582afbacc99c583a916b9981dd2728f4ae6fdb82efd087cc3b7849e05798d2d2785c03b0879594eeac82c01f235d0e717736",
		"Timestamp" : "2012-04-26T20:45:04.751Z",
		"SignatureVersion" : "1",
		"Signature" : "EXAMPLEpH+DcEwjAPg8O9mY8dReBSwksfg2S7WKQcikcNKWLQjwu6A4VbeS0QHVCkhRS7fUQvi2egU3N858fiTDN6bkkOxYDVrY0Ad8L10Hs3zH81mtnPk5uvvolIC1CXGu43obcgFxeL3khZl8IKvO61GWB6jI9b5+gLPoBc1Q=",
		"SigningCertURL" : "https://sns.us-west-2.amazonaws.com/SimpleNotificationService-f3ecfb7224c7233fe7bb5f59f96de52f.pem"
		}`)

	var msg SnsMessage

	err := json.Unmarshal(body, &msg)

	if err != nil {
		panic(err)
	}

	fmt.Println(msg)
}