Dual idempotent PSP
Bold covers Colombia/LatAm with HMAC signing; PayPal covers global buyers. Webhooks confirm payment once and trigger the same provisioning path — no double access or ghost states.
EdTech & Payments
Course platform + payments
Bilingual Django LMS: guest checkout, Bold + PayPal, 12-month access, 100-question exam and cost-controlled AI tutor.
Context
Digital product for Claude Architect certification prep: low-friction funnel (guest checkout), retention, lead magnet, 1:1 mentoring and B2B track, with rate-limited AI tutor.
Product gallery
Real screenshots of the system in operation.
Problem
- 1Charge locally and globally (Bold + PayPal).
- 2Unlock access automatically after payment.
- 3Control AI tutor cost.
- 4SEO/GEO/AEO + ES/EN i18n.
The approach
01
Django + HTMX
LMS and catalog with native i18n and static Tailwind.
02
Idempotent payments
Bold (HMAC) and PayPal Smart Buttons + webhooks.
03
Guarded tutor
Keyword RAG + cache/rate-limit.
04
Growth loops
Lead-magnet mini-quiz and mentoring/B2B plans.
Architecture
ArchitectureInteractive · hover or focus each layer
Visitor → Django LMS → Bold/PayPal → 12-month access → lessons/exam + RAG tutor on Postgres.
System layers
- 01Sales catalog / landing
- 02Accounts + timed access
- 03Bold/PayPal payments
- 04Courses + exam
- 05RAG assistant
- 06B2B leads / mentoring
Applied stack
- Django
- HTMX
- PostgreSQL
- Bold
- PayPal
- RAG
- Tailwind
Learning flow
Journey architecture: from visitor to certified learner
This LMS is not just a lesson catalogue. It is a digital-product funnel with idempotent payments, automatic access provisioning, a unit-economics-aware AI tutor and a 100-question exam. Every stage has a clear surface and a success criterion.
Operating pipeline
How the learner moves through the system
- 01
Catalogue / marketing
Discovery
Bilingual ES/EN landing with the Claude Architect promise, visible plans and SEO/GEO/AEO. The visitor sees the outcome before paying.
- 02
Growth loop
Lead magnet
Mini-quiz or interest capture that warms the funnel without a card. Creates a lead and measures intent before checkout.
- 03
Commercial offer
Plan choice
Fast-Track, 1:1 Mentoring or B2B track. Price and scope live in the UI; the system does not invent SKUs at runtime.
- 04
Payments
Guest checkout
Pay without creating an account first. Bold (HMAC, LatAm) or PayPal Smart Buttons (global) with idempotent webhooks so access is never duplicated.
- 05
Accounts + entitlements
Access provisioning
After confirmed payment the account is created and a 12-month window opens. The learner enters the LMS without a support ticket.
- 06
Courses runtime
Lessons and progress
Course content on Django + HTMX: light navigation, progress in PostgreSQL, native bilingual experience.
- 07
Assistant + guardrails
AI tutor (RAG)
Assistant over course material with cache and rate limits. Answers from domain context; product margin is not burned on tokens.
- 08
Assessment + retention
Exam and close
100-question bank to validate Claude Architect prep. Mentoring/B2B remain a natural upsell after progress.
System capabilitiesCommerce Accounts LMS AI Assessment Growth
Layers that carry the product
Each capability exists for a concrete trade-off: frictionless conversion, LatAm + global collection, 12-month retention and margin protected from tutor token cost.
12-month entitlement
Access rights are a domain resource: created on pay, expire on a clear date and gate lessons, exam and tutor. Not a loose session flag.
Course runtime on Django + HTMX
Catalogue, lessons and navigation without a heavy SPA. Native ES/EN i18n, static Tailwind and WhiteNoise ready for Render/Railway. Operable product over framework fashion.
RAG tutor with cost control
Retrieval over course corpus, answers grounded in material, cache for frequent turns and per-learner rate limits. The tutor is a retention feature, not an inference sink.
100-question exam
Assessment aligned to the Claude Architect certification promise. Proves mastery and signals progress for mentoring upsell.
Mentoring / B2B loops
Beyond self-serve: 1:1 mentoring and a company track. The same payments and accounts stack feeds higher-ticket offers without a second monolith.
Design decisions
Guest checkout
Less friction = more conversion for digital goods.
Dual PSP
LatAm coverage (Bold) + global (PayPal).
Tutor rate-limits
Course margin must not evaporate into tokens.
Impact
- 12m
- Post-payment access
- 100
- Exam questions
- 2
- PSPs (Bold + PayPal)
Key points
- Guest checkout: account created after payment.
- Unit economics protected on the AI tutor.
- Render/Railway ready with WhiteNoise.
Fit / how to hire
Hire this if you need senior product/engineering for EdTech or growth-with-payments who protects unit economics, not just checkout. Deliverables: funnel → charge → access → retention, with the AI tutor's cost under control.
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