idempotency for microservices how do you make sure it works tho

hey everyone, im wrestling with idempotency in our microservices architecture. were using kafka for event streaming between services, and ensuring that message processing is idempotent is crucial to avoid duplicate operations, especially during retries or network hiccups. what strategies or patterns have you found most effective for implementing idempotency in your microservices? are there specific libraries or tools you recommend, or do you typically build custom solutions? curious to hear your experiences and best practices