EVT 2026-02-18 - Stage A2/B/C/D Register, Profile, Entitlement, and Notification Deepening

DomainsDOL EnglishProduct988 words5 min read

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Session scope

Promote newly confirmed execution-level rules after baseline DEC-0040..0043, with focus on:

Ignore includes both: (a) no click and (b) click then leave without submission.
Ignore streak is evaluated at end-of-session (30m idle or session exit).
Strategy change order after ignore streak threshold: difficulty -> format -> skill.
Feedback model is full like/dislike at recommendation-cluster level.
Cluster dislike persists for future clusters; feedback interaction does not reset ignore streak.
If user dislikes and exits without attempt, still count ignore +1.
Recommendation default set size and structure are locked as 5 items = 2 habit + 2 target + 1 explore, with low-inventory shrink to minimum 3.
Manual controls (skill/difficulty/duration) are soft-priority, session-scoped across pages, and no-match uses nearest-ladder with short notice.

Existing email/phone entered on signup auto-switches to OTP login and auto-sends OTP.
Contacts (email/phone) are unique per account.
Account merge/transfer is not supported; duplicate accounts remain separate.
Users can self-add missing email/phone and link social identities.
Auth model shifts to password-first with OTP fallback.
Email/phone signup requires password creation at signup + OTP verification.
Password policy baseline: minimum 6 characters (simple baseline for V2).
OTP policy baseline: validity 10 minutes, resend cooldown 60 seconds.
Social account can set local password later; social username can seed display-name default.
Phone is optional globally (not hard-required for all accounts).
Social account without phone can still use platform normally; contact completion is nudged later.
Trusted device window is 30 days.

Password reset uses OTP on primary contact.
Failed password attempts trigger temporary lock with OTP unlock path.
New-device password login requires step-up OTP.
Account deletion model is soft-delete 30 days with manual restore confirmation.
When delete is initiated, monthly auto-renew is canceled immediately.
Post hard-delete retention keeps legal finance records only.
Contact change requires password + OTP on new contact; old contact receives security alert.
No post-change hold window for sensitive actions.
If social account has no usable email recovery path, fallback is CS recovery.
Social email can be primary recovery channel when usable.
Social account must have at least one verified recoverable contact before local-password setup.
Contact change cooldown remains:
- email: 1/24h,
- phone: 1/7 days.

V2 package cycles: monthly auto-renew + one-time 3/6-month non-renew.
Payment methods: card + Momo + bank QR.
Bank QR/chuyển khoản applies to one-time only.
If user buys monthly while one-time still active, monthly starts after one-time expiry (queue behavior).
Monthly cancel takes effect at cycle end.

Free users in Writing/Speaking can see basic score, while AI detail sections stay locked.
Pro has no advanced AI credit.
Purchased top-up balance is retained but usage is locked when user is outside eligible entitlement context.

Course purchase is not blocked by requiring Pro/Pro Max.
Course checkout keeps optional add-on suggestion for Pro/Pro Max (not mandatory bundle).
Entitlement is context-bound by default, with same-item exception:
- same exercise touched in course can be unlocked in self-study view.
Course learners can use AI in course scope via course credit model (without requiring Pro Max).
Course credit issuance cadence is monthly refill during course.
When course credit exhausts, user can top-up directly (no Pro Max requirement).
Top-up usage for course learner is course-scope only when no suitable subscription exists.
Course exercises remain accessible after course end.
Remaining top-up and included course credits are kept indefinitely but only usable for exercises of that course.

Combined daily cap for nudges is global 1/day.
If both goal and profile prompts are missing, priority is goal first.
Badge surface strategy: profile-first with light Home mention.
Profile progress recalculates live on current data.
Profile visibility default is private.
V2 achievement scope: track + display only; social sharing is deferred but data-ready.
Milestone reward anti-abuse: one-time award per milestone.
Display-name is optional; default uses auto-generated fun nickname (social may seed from social username).
Academic profile minimum uses Program + Score goal, both optional with partial completion allowed.
Payment milestone is visible to all users and is weighted in profile completion model.

1/day cap applies to engagement nudges only (not all notification types).
Same-day trigger arbitration prioritizes highest return-risk trigger.
Overflow nudges queue to next eligible day.
Engagement reminder sends run on all enabled channels in parallel.
Failed channel delivery retries continue on failed channels until stop condition.
AI-score-ready notification rule: always center entry + optional toast/push one-shot (no repeat loop).

Score bands are locked to:
- 0-19 chưa đạt,
- 20-59 cần cải thiện,
- 60-79 khá,
- 80-99 giỏi,
- 100 xuất sắc.
Scaled-score exercises normalize by max score to percent before banding.
Unanswered objective items count as wrong.
Streak day boundary uses user local timezone.
Streak completion attribution uses submit timestamp.
Freeze auto-consumes on first missed day.
KPI minimum set:
- primary = habit retention,
- secondary growth = locked-feature upgrade conversion,
- secondary quality = recommendation-to-attempt rate.

Age-gate policy finalization for DOL English web V2 was not finalized in this session.
Duplicate-account mismatch warning surface (non-blocking hint vs no hint) remains unconfirmed.