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Learn how to add an OAuth2 Authorization Code security scheme to an OpenAPI document so Swagger UI shows an Authorize button, completes the flow, and attaches Bearer tokens to test calls.
Learn how PKCE adds a verifier/challenge pair to the OAuth 2.0 authorization code flow, protecting public clients from authorization‑code interception without requiring a client secret.
Learn how to diagnose and fix OAuth 2.0 PKCE authorization‑code exchange failures that produce invalid_grant or invalid_request errors.
Learn why OAuth 2.0 returns 'invalid_grant' when exchanging an authorization code, how to spot the exact cause with a diagnostic table, and step‑by‑step checks to fix redirect URI mismatches, code reuse, expiration, or clock skew.
Implement OAuth 2.0 Authorization Code Flow with PKCE in a single‑page app: register the client, generate code_challenge, handle redirects, exchange tokens, validate ID tokens, store securely, and rotate refresh tokens. Verify each step with network tools and CSRF tests.
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