I want a one-time “Merry Christmas” promotion to greet every visitor to my GitHub-hosted store. The plan is simple: an elegant, minimalistic popup announces a limited-time discount and lets shoppers know they can pay with Bitcoin, Ethereum or Litecoin. What I already have • The store’s codebase is on GitHub Pages. • Wallet addresses for BTC, ETH and LTC. • Basic discount logic worked out (percentage and duration). What I need from you 1. A lightweight, responsive popup that loads fast, matches the store’s current palette, and captures that Christmas feeling without being overly festive. 2. Seamless integration into the existing HTML/CSS/JS so the popup triggers on the first page load, then respects a “don’t show again” cookie. 3. Crypto checkout flow added or wired up to the three wallets—ideally via a trusted JavaScript payment library so customers are guided through QR / address copy with one click. 4. Clear README updates and a pull request to the GitHub repo showing exactly where your code lives and how to tweak the discount for future sales. Acceptance criteria • Popup design matches “Elegant and minimalistic” mock-up signed off by me. • Discount automatically applied at checkout for crypto payments. • Works on modern desktop and mobile browsers with no console errors. • All changes merged via pull request and thoroughly commented.