Akhil developed a changeset-aware MerchantAccountInterface for the Mockdb in the juspay/hyperswitch repository, focusing on enhancing testability and future-proofing merchant account updates. Working in Rust within the router crate, Akhil refactored mock database data retrieval and update logic to support both v1 and v2 changeset-driven updates, integrating this behavior with feature flags for controlled rollout. The implementation involved careful restructuring of mock data paths and wiring new logic to existing API development patterns. This work addressed the need for safer, more reliable mocks and clearer feature gating, laying a foundation for robust, changeset-based merchant account management in testing environments.