Amazon This document provides best current practices for implementing and deploying OAuth 2.0 Transaction Tokens as specified in draft-ietf- oauth-transaction-tokens. Transaction Tokens (Txn-Tokens) enable workloads in a trusted domain to preserve and propagate user identity and authorization context across service boundaries during the processing of external programmatic requests. This BCP addresses practical deployment considerations including token service architecture, size management, propagation patterns, validation strategies, and operational monitoring that are essential for secure and effective implementation in production environments.