example alexa skill handler

lwa_blog.js

const HelloWorldIntentHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest' && handlerInput.requestEnvelope.request.intent.name === 'HelloWorldIntent';
    },
    async handle(handlerInput) {
        const {
            accessToken
        } = handlerInput.requestEnvelope.context.System.user;
        let speechText = '';
        if (!accessToken) {
            speechText = 'You must authenticate with your Amazon Account to use this skill. I sent instructions for how to do this in your Alexa App';
            return handlerInput.responseBuilder.speak(speechText).withLinkAccountCard().getResponse();
        } else {
            speechText = 'Hello World!';
            return handlerInput.responseBuilder.speak(speechText).getResponse();
        }
    }
}