This document describes how WLCG users may use the available geographically distributed resources without X.509 credentials. In this model, clients are issued with bearer tokens; these tokens are subsequently used to interact with resources. The tokens may contain authorization groups and/or capabilities, according to the preference of the Virtual Organisation (VO), applications and relying parties. Wherever possible, this document builds on existing standards when describing profiles to support current and anticipated WLCG usage. In particular, three major technologies are identified as providing the basis for this system: OAuth2 (RFC 6749 & RFC 6750), OpenID Connect and JSON Web Tokens (RFC 7519). Additionally, trust roots are established via OpenID Discovery or OAuth2 Authorization Server Metadata (RFC 8414). This document provides a profile for OAuth2 Access Tokens and OIDC ID Tokens.