Javascript to apply all chase offers

chaseoffers.js

/**
  APPLY CHASE BANK CC OFFERS
  This script helps you apply all the Chase bank credit cards automatically. 
      - Login to Chase and go to https://secure03b.chase.com/web/auth/dashboard#/dashboard/offers/index.
      - Open 'Inspect Element'
      - Paste this in the console and hit enter
*/
const BUTTON_CLASSNAME = 'iconAddToCard';
const ALREADY_APPLIED_OFFER_CLASSNAME = 'confirmation';
function timeout(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

const getButtons = () => {
    const allButtons = document.getElementsByClassName(BUTTON_CLASSNAME);

    let validButtons = [];

    for (let j=0; j < allButtons.length; j++) {
        if (allButtons[j].getElementsByClassName(ALREADY_APPLIED_OFFER_CLASSNAME).length <= 0) {
            validButtons.push(allButtons[j])
        }
    }

    return validButtons;
}


const begin = async () => {
    let buttons = getButtons();

    while (buttons.length > 0) {
        let btn = buttons[0];
        btn.click();

        await timeout(1500);

        let close = document.getElementById('flyoutClose');
        close.click();

        await timeout(1500);
        
        buttons = getButtons();
    }
}

begin();