Applying asynchronous functions to facebook chatbot messages in specific order - node.js

Question

I'm doing a chatbot for facebook and I have a problem with the order of sending messages
I send in the chat:
-Hi
The bot responds in the console:
-Hello!
-How can I help you?
but in the chat responds like this:
-How can I help you?
-Hello!
I tried to apply async and await, but it didn't work.
let postWebhook = (req, res) => {
// Parse the request body from the POST
let body = req.body;
// Check the webhook event is from a Page subscription
if (body.object === 'page') {
// Iterate over each entry - there may be multiple if batched
body.entry.forEach(function (entry) {
// Gets the body of the webhook event
let webhook_event = entry.messaging[0];
// Get the sender PSID
let sender_psid = webhook_event.sender.id;
// Check if the event is a message or postback and
// pass the event to the appropriate handler function
if (webhook_event.message) {
handleMessage(sender_psid, webhook_event.message);
}
});
// Return a '200 OK' response to all events
res.status(200).send('EVENT_RECEIVED');
}};
let handleMessage = async (sender_psid, received_message) => {
let response;
if (received_message.text) {
addUrl(`url/facebook?mensage=${received_message.text}&usuario=${user}&session=${sender_psid}&origem=${chanel}`)
.then(res => res.json())
.then(async json => {
for (var i = 0; i < json.length; i++) {
console.log(json[i].text || json[i].title)
response = {json[i].text || json [i] tittle}
await callSendAPI(sender_psid, response) //function to verify user and send message
}
})
await callSendAPI(sender_psid, response);
}
};
How can I ensure the correct order?

Answer 1

Well you can simplify this way:
const callSendAPII = (sender_psid, response) => {
return new Promise((resolve, reject) => {
let request_body = {
"recipient": {
"id": sender_psid
},
"message": response
}
request({
uri: 'https://graph.facebook.com/v12.0/me/messages',
qs: {"access_token": MY_IG_PAGE_TOKEN},
method: 'POST',
json: request_body,
}, (error, response, body) => {
if (error) {
reject(error);
} else {
resolve(response);
}
});
})
now just apply await in the calling function:
await callSendAPII(sender_psid, response)