Slack message based on date in Google Spreadsheet - google-apps-script

Question

I have a spreadsheet with several payment dates and want to create a slackbot to post a message to Slack when the date in one specific column match today's date. I'm very new to coding and I'm using a code I found to send an email, but can't find nothing about posting it to Slack. Could someone give me a hand, please?
This is the code I'm using to send email:
function emailAlert() {
// today's date information
var today = new Date();
var todayMonth = today.getMonth() + 1;
var todayDay = today.getDate();
var todayYear = today.getFullYear();
// getting data from spreadsheet
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 2; // First row of data to process
var numRows = 100; // Number of rows to process
var dataRange = sheet.getRange(startRow, 1, numRows, 999);
var data = dataRange.getValues();
//looping through all of the rows
for (var i = 0; i < data.length; ++i) {
var row = data[i];
var expireDateFormat = Utilities.formatDate(
new Date(row[6]),
'ET',
'yyyy/MM/dd'
);
// email information
var subject = '';
var message =
'Hello' +
'\n' +
'\n' +
'These are the due dates for today:' +
'\n' +
'\n' +
' ID number: ' +
row[0] +
'\n' +
' Name: ' +
row[1] +
'\n' +
' Due date: ' +
expireDateFormat;
//expiration date information
var expireDateMonth = new Date(row[6]).getMonth() + 1;
var expireDateDay = new Date(row[6]).getDate();
var expireDateYear = new Date(row[6]).getFullYear();
//checking for today
if (
expireDateYear === todayYear &&
expireDateMonth === todayMonth &&
expireDateDay === todayDay
)
{
var subject =
'Due date ' + row[1] + ' - ' + expireDateFormat;
MailApp.sendEmail('email address here', subject, message);
Logger.log('todayyyy!');
}
}
}

Answer 1

Here is a http post request shows how to send a post to Slack
POST https://slack.com/api/chat.postMessage
Content-type: application/json
Authorization: Bearer xoxb-your-token
{
"channel": "YOUR_CHANNEL_ID",
"text": "Hello world :tada:"
}
Chackout more information from : https://api.slack.com/messaging/sending