Design a Webhook Delivery System

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

Problem Statement

Stripe uses webhooks to notify you in real-time about events that happen in your account. For example, when a charge succeeds or fails, or when a new customer is created. You can set up webhooks to listen for specific events and then handle those events in your application.

Design a system that delivers webhooks to your customers. The system should be able to handle the following requirements:

1. High Availability: The system should be highly available and should not lose any events.
2. Reliability: The system should ensure that each event is delivered at least once.
3. Scalability: The system should be able to handle a large number of events and customers.
4. Idempotency: The system should not deliver duplicate events.
5. Rate Limiting: The system should handle rate limiting to avoid overwhelming the customer's server.
6. Retries: The system should handle retries in case of failures.
7. Monitoring: The system should provide monitoring and alerting for failures and other issues.

Examples

1. Event Creation: When a charge is created, an event is created in the system.
2. Webhook Delivery: The system delivers the event to the customer's webhook endpoint.
3. Retry: If the delivery fails, the system retries the delivery after some time.

Constraints

1. Event Volume: The system handles millions of events per day.
2. Customer Volume: The system has thousands of customers.
3. Event Size: Each event is around 1KB in size.
4. Delivery Latency: The system should deliver events within a few seconds.

Hints

1. Message Queue: Use a message queue to buffer events and handle retries.
2. Database: Use a database to store events and their delivery status.
3. Caching: Use caching to store recently delivered events and avoid duplicates.
4. Load Balancing: Use load balancing to distribute events across multiple servers.

Solution

You can find the solution on ShowOffer.io: Design a Webhook Delivery System - Stripe System Design Interview

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