Double Holo: Card Marketplace

1. Download the app, create an account, and complete basic profile and payment verification. 2. To buy, search or filter by game, set, rarity, condition, and price, then add items to cart and check out with secure payment and chosen shipping. 3. To sell, tap Sell, scan your card or search by set, confirm auto-filled details, set condition and price or start an auction, choose shipping, and publish. 4. Manage deals in Orders: message buyers or sellers, accept offers, print shipping labels, mark shipped, and track delivery. 5. Grow your collection: add items to Portfolio or Watchlist, set price alerts, review market trends, and export inventory for business reporting.