Developed a dedicated error handling framework for the KodyPay/kp-protocols-clientsdk repository, focusing on enhancing client reliability through explicit error reporting. The work centered on designing new Protocol Buffers definitions, including an error.proto file with a KpError enum to extend gRPC status codes with specific error types. Additionally, a poc.proto file was introduced, defining a PocService and ErrorCodePoc RPC to facilitate testing of error code handling within the client SDK. Using protobuf and gRPC, this effort established a scalable foundation for consistent error visibility, improved testability, and laid groundwork for future error-code driven workflows across client applications.