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 changesets, integrating this behavior with feature flags for controlled rollout. The implementation involved careful restructuring of mock data paths and wiring of feature-gated logic, enabling safer and more reliable testing scenarios. This work delivered a single, cohesive feature that lays the groundwork for changeset-driven updates, demonstrating depth in API development, database design, and mocking.