Yegor Pomortsev enhanced the OAuth client authentication flow for the pocket-id/pocket-id repository by implementing a decoding mechanism for URL-encoded client IDs and secrets within the Authorization header. He developed a reusable utility in Go to normalize and securely process client credentials, addressing issues with misencoded values that previously led to authentication failures. This work improved both the security and reliability of the OAuth credential handling process, reducing errors across the authentication flow. Yegor’s contribution focused on backend development and API security, demonstrating a targeted approach to solving a specific problem in credential processing within a production authentication system.