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- /api/internal/grant: secret-auth endpoint for payment-router to provision access on a paid order — find-or-create user (emailVerified, temp password, mustChangePassword), enroll by course slug list, AccessLog, delivery email. Idempotent by order_id. - User.mustChangePassword flag (+ migration); (student) layout redirects flagged users to /change-password (forced first-login change). - email.ts: sendCourseGrantEmail (temp password for new buyers). - middleware: /api/internal is public (own secret auth). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>