Worked on enhancing security and enterprise readiness in the BitGoJS repository by improving access token creation and the SSO authentication flow. The development introduced an optional enterprise field to the access token options, enabling association of enterprise IDs during token creation. The access token issuance process was updated to support SSO and WebCrypto users by allowing HMAC authentication, which prevents unnecessary protocol downgrades when a valid HMAC strategy is present. The work was implemented using TypeScript and Node.js, with comprehensive unit testing using Sinon and Nock to validate new authentication paths and ensure regression safety across the updated SDK functionality.