CB-SVRLESS-3 - Replying to messages

CB-SVRLESS-3-ReplyMessages.js

module.exports.fbMessages = (event, context, callback) => {
    event.body.entry.map((entry) => {
        entry.messaging.map((messagingItem) => {
            if (messagingItem.message && messagingItem.message.text) {
                const url = `https://graph.facebook.com/v2.6/me/messages?access_token=<your access token here>`;

                const responsePayload = {
                    recipient: {
                        id: messagingItem.sender.id
                    },
                    message: {
                        text: messagingItem.message.text
                    }
                };

                nodeFetch(
                    url,
                    {
                        method: 'POST',
                        body: JSON.stringify(responsePayload),
                        headers: {'Content-Type': 'application/json'}
                    }
                )
                    .then(res => res.json())
                    .then(json => {
                        console.log("Json result ", json);
                        callback(null, json)
                    })
                    .catch(error => {
                        console.error("Call failed ", error);
                        callback(null, error)
                    });
            }
        });
    });
};