Developed a token renewal idempotency feature for the NordSecurity/nordvpn-linux repository, focusing on enhancing the reliability of the authentication flow. The work involved integrating an idempotency key into the backend token renewal process using Go and JSON, ensuring that repeated requests—such as those caused by network retries or expired tokens—would not result in duplicate renewals. This approach improved error handling and user trust by making the token renewal process robust against accidental duplication. The implementation addressed issue #695 and was prepared for review and QA, demonstrating a methodical approach to API integration and backend development within a production environment.