//! Core service implementations for `ez-token`.
//!
//! This module groups the infrastructure layer, kept intentionally separate
//! from CLI concerns in [`crate::cli`]. Each submodule handles a distinct
//! technical responsibility required by the OAuth2 flows.
/// OAuth2 flow implementations for Microsoft Entra ID and Auth0.
/// Shared HTTP client configured for OAuth2 token requests.
/// Local callback server for the PKCE authorization redirect.