Developed custom token endpoint support for service account credentials in the stackitcloud/stackit-sdk-go repository, focusing on enhancing authentication flexibility for enterprise integrations. The work involved extending the ServiceAccountKeyCredentials structure and refactoring token retrieval logic to accommodate configurable endpoints, enabling smoother integration with external identity providers. By leveraging Go for backend development and API integration, the changes reduced setup complexity and improved the reliability of token flows within the SDK. This feature positioned the library for easier adoption in enterprise environments requiring custom authentication flows, reflecting a targeted approach to solving integration challenges in backend systems using Go and API technologies.