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Backend Ai on Instagram: "Answer 👇 Step 1️⃣ The UI label (“Only 1 left”) is NOT the truth. The server decides using inventory state. Step 2️⃣ On “Buy Now”, Amazon tries an ATOMIC reservation: stock = stock - 1 (only if stock > 0) Only ONE request succeeds ✅ Others fail immediately ❌ Step 3️⃣ If you fail reservation, you may still see: “Out of stock” / “Item just sold out” even if you reached checkout. Step 4️⃣ If reservation succeeds, Amazon creates: reservation_id + TTL (ex: 10 minutes) This i