Description

An idempotency key is a unique token that identifies a request. If a client sends the same request with the same idempotency key multiple times, the server will rely on the key to ensure the request is processed only once.

Where to use

• Payment processing APIs.
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• Unreliable network conditions.
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• Preventing duplicate actions on retries.

Real World Example

Stripe API: If a timeout occurs during a charge request, the client retries with the same Idempotency-Key. Stripe checks the key and returns the original successful response instead of charging again.

Code Example

# Code Concept for Idempotency Keys
# This pattern is architectural.

class Service:
    def execute(self):
        # Implementation logic
        pass