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IAThis is a classic real-world system design question every backend developer should know.
Let’s break it down :
1️⃣ Idempotency Key
Definition: Assign a unique ID to each API request so the backend recognizes duplicates.
Example: User clicks “Pay Now” twice → processed only once using the same payment_id.
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2️⃣ Disable Button / Debounce
Definition: Stop multiple clicks from triggering duplicate API calls.
Example: Disable or delay the “Submit” button immediately after the first click.
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3️⃣ Database Lock or Unique Constraint
Definition: Prevent duplicate entries at the database level.
Example: Reject new records if the same order_id already exists.
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4️⃣ Queue Deduplication
Definition: Definition: Ensures that repeated messages in a queue (like Kafka or SQS) aren’t processed multiple times.
Example: If two messages have the same ID, only one is processed.
esifn
#systemd
(API reliability, real-world system design, Stripe architecture, payments, stripe, razorpay, backend systems, scalable systems, api development, idempotent)
@iamrajpadval










