Design a Payment System

Here is the full interview question "Design a Payment System - Stripe System Design Interview | ShowOffer" from Stripe on ShowOffer.io:

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Problem Statement

Design a payment system similar to Stripe. The system should support the following functionalities:

1. Create a Payment: Create a payment with a given amount and currency.
2. Process a Payment: Process the payment and return a success or failure status.
3. Refund a Payment: Refund a payment and return a success or failure status.
4. Get Payment Status: Get the current status of a payment.

Constraints:

1. The system should support multiple currencies.
2. The system should handle high traffic and large payment volumes.
3. The system should be fault-tolerant and highly available.
4. The system should ensure data consistency and accuracy.

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Examples

1. Create a Payment: Create a payment of $100 in USD.
2. Process a Payment: Process the payment created in the previous step.
3. Refund a Payment: Refund the payment processed in the previous step.
4. Get Payment Status: Get the status of the payment processed in the previous step.

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Constraints

1. The system should support multiple currencies.
2. The system should handle high traffic and large payment volumes.
3. The system should be fault-tolerant and highly available.
4. The system should ensure data consistency and accuracy.

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Hints

1. Consider using a distributed database to store payment information.
2. Implement a message queue to handle payment processing and refunds.
3. Use caching to improve performance and reduce database load.
4. Implement rate limiting and retry mechanisms to handle high traffic.

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Solution

A detailed solution to this problem can be found on ShowOffer.io: Stripe System Design Interview

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NOTICE: The solution provided above is a summary and not the complete solution. For the full solution, please refer to the original source on ShowOffer.io.