Developed Kafka-based webhook subscriptions support for the Shopify/cli repository, enabling internal Shopify apps to declare kafka:// URIs in their webhook subscription configurations. Leveraged TypeScript and Zod to implement regex-based validation for Kafka topic formats, ensuring client-side checks align with server-side rules. Enhanced error messaging and expanded test coverage to address both valid and invalid Kafka URIs, as well as combined-URI scenarios. This work streamlined the process for internal apps to adopt event-driven automation, reduced friction by improving consistency between client and server validation, and provided clearer guidance for developers integrating Kafka-based webhooks into the Shopify ecosystem.