On Amazon Gaming, add a button below "Games free with Prime" to click all "Claim game" buttons (Does not click on external offerings)

Amazon_Gaming_Claim_All_Games_button.js

// ==UserScript==
// @name         Amazon Gaming "Claim All Games" button
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Adds a button below "Games free with Prime" to click all "Claim game" buttons; Does not click on external offerings
// @author       nakami
// @match        http*://gaming.amazon.com/*
// @icon         https://d2u4zldaqlyj2w.cloudfront.net/02b601d4-a3ab-41e5-b8ab-1083f15f1c68/favicon.ico
// @grant        none
// @run-at       document-idle
// ==/UserScript==

/*
  Support me by donating to my PayPal:
  https://www.paypal.com/donate/?hosted_button_id=VNDER8T6AZ732
  Thank you!
*/

(function() {
  'use strict';

  function claimAll() {
    console.log('Claim All Games');
    let claimBtns = document.querySelectorAll('[data-a-target="offer-section-FGWP_FULL"] button[data-a-target="FGWPOffer"]');
    //let claimExternalBtns = document.querySelectorAll('[data-a-target="offer-section-FGWP_FULL"] button[data-a-target="ExternalOfferClaim"]');
    console.log("found number of buttons:" + claimBtns.length);
    for (var i = 0, len = claimBtns.length; i < len; i++) {
      claimBtns[i].click();
    }
  };

  function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  sleep(2000).then(() => {
    let title = Array.from(document.getElementsByClassName("offer-list__section-title")).at(-1);
    let newBtn = document.createElement('button');
    newBtn.setAttribute('class', 'tw-interactive tw-button tw-button--prime');
    let newSpan = document.createElement('span');
    newSpan.setAttribute('class', 'tw-button__text');
    newBtn.appendChild(newSpan);
    let newP = document.createElement('p');
    newP.setAttribute('class', 'tw-amazon-ember-regular tw-font-size-6 tw-lg-font-size-6 tw-md-font-size-6 tw-sm-font-size-6 tw-xl-font-size-6 tw-xs-font-size-6 tw-xxl-font-size-6');
    newBtn.onclick = claimAll;
    newP.textContent = 'Claim All Games';
    newSpan.appendChild(newP);
    title.parentNode.insertBefore(newBtn, title.nextSibling);
  });
})();