implementing, by a computer system, a messaging platform that enables a messaging session to be established between an agent and a user that uses any of a plurality of messaging channels to communicate with the agent during the messaging session;

causing, by the computer system, an agent interface to be displayed to the agent that includes a configurable authorization request component that enables the agent to authenticate the user as part of the messaging session independent of a messaging channel used by the user;

based on receiving an indication that the configurable authorization request component has been selected by the agent via the agent interface that is displayed to the agent for communicating with the user, the computer system communicating with a channel system associated with the messaging channel to route a device of the user to an endpoint authentication system to authenticate the user;

receiving, by the computer system from the channel system, a response generated based on an authentication of the user at the endpoint authentication system; and

causing, by the computer system, the agent interface to present, to the agent, an indication of whether the user authenticated.