Assess learners' ability to apply the OAuth 2.0 Authorization Code Flow with PKCE to secure single-page applications, including selecting/configuring the correct flow, generating and validating code verifier/challenge, constructing and interpreting the authorization and token exchange HTTP requests/responses, safely storing and refreshing tokens in browser contexts, implementing logout and redirect handling, and mitigating common threats (CSRF, XSS, token leakage) when integrating with third‑party identity providers.