Sending verification OTP to user-email with mailgun in a React, Node and Mongo App.

I will implement a feature to an existing simple MERN stack app, to send an email to the visitor of a site containing a randomly generated unique code which the visitor will need to verify to view a document on the site.

async.waterfall([], function (err) {});
async.waterfall([
function firstStep(done) {
done(null, 'Value from step 1');
},
function secondStep(previousResult, done) {
console.log(previousResult);
done(null);
}
],
function (err) {});

ComputerVision | NLP | Kaggle Master. Ex International Financial Analyst. Linkedin — https://bit.ly/3yBFni6 | My Youtube Channel — https://bit.ly/3zGNvzc