getotp.js

const axios = require("axios").default;

const CLIENT_ID = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
const CLIENT_SECRET = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
const PHONE = process.argv[2];
const DOMAIN = 'xxxxxx.us.auth0.com';

const options = {
    method: 'POST',
    url: `https://${DOMAIN}/passwordless/start`,
    headers: {'content-type': 'application/json'},
    data: {
        client_id: CLIENT_ID,
        client_secret: CLIENT_SECRET,
        connection: 'sms',
        phone_number: PHONE,
        send: 'code'
    }
};

axios.request(options).then(function (response) {
    console.log(response.data);
}).catch(function (error) {
    console.error(error);
});

verify.js

const axios = require("axios").default;

const CLIENT_ID = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
const CLIENT_SECRET = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
const PHONE = '+xxxxxxxxxxxxx;
const DOMAIN = 'xxxxxx.us.auth0.com';
const OTP = process.argv[2];

const options = {
    method: 'POST',
    url: `https://${DOMAIN}/oauth/token`,
    headers: {'content-type': 'application/json'},
    data: {
        grant_type: 'http://auth0.com/oauth/grant-type/passwordless/otp',
        client_id: CLIENT_ID,
        client_secret: CLIENT_SECRET,
        username: PHONE,
        otp: OTP,
        realm: 'sms',
        audience: 'http://localhost:4000',
        scope: 'openid profile email'
    }
};

axios.request(options).then(function (response) {
    console.log(response.data.access_token);
}).catch(function (error) {
    console.error(error);
});