During July 2026, this developer enhanced the Shopify/rails repository by delivering a configurable HTTP token authentication feature with foundational support for DPoP. The implementation focused on backend development using Ruby, introducing scheme-specific validation and forwarding authentication scheme awareness to the application layer. This allowed controllers to enforce particular authentication schemes and respond with RFC-compliant WWW-Authenticate prompts when mismatches occurred, improving both security and interoperability. The work laid the groundwork for RFC 9110 and RFC 9449 compliance, streamlining integration for developers and enabling more robust HTTP authentication flows within Rails applications, with an emphasis on maintainability and standards adherence.