A teachers’ e-learning platform: a price engine, bundles, coupons and solved exams

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One service works out the price of a course, an exam or a basket of courses. It takes the item, the student and an optional coupon or bundle, and answers with the original price, the discount, its source and the final price. Students pay only from a wallet: they ask for a top-up and an admin approves it, and each purchase becomes an order with the commission and the teacher’s share. A purchase gives access for a number of days.

1. Decision 1

   One discount, never stacked

   A price is easy to predict and to explain when exactly one source applies and the answer names it, for a student, a teacher and an admin looking at the same order.

   Trade-off · A coupon replaces a bundle’s discount rather than adding to it, so it wins even when the bundle would have taken more off.

2. Decision 2

   Buy now, unlock in order

   A student can buy a teacher’s whole series at once, while each course still opens only after the ones before it are finished, which keeps the teacher’s intended sequence.

   Trade-off · The sequence is the order in which the courses were created, not one the teacher sets, and a student can hold a course they cannot open yet.

3. Decision 3

   A bundle is orders, not a record

   Buying a bundle makes one order for each course, so each keeps its own expiry, commission and teacher’s share, and appears in the lists and reports that already existed.

   Trade-off · Nothing ties those orders back to the bundle, so a report by bundle has to be rebuilt from the courses it contained.

4. Decision 4

   A paid exam leads to its explanation

   A student who falls short is offered the solution at the moment they want it, and the teacher’s explanation becomes something a student can buy on its own.

   Trade-off · Every paid exam needs a solved-exam course first, which a teacher must record before the exam can be saved.

• One discount at a timeFor a course the engine tries, in order, a valid coupon, the discount of the bundle the course is bought in, the course’s own fixed discount, and otherwise the plain price. Only the first that applies is used, nothing stacks, and the answer says which one it was.
• Coupons with rulesA coupon is a percentage with a cap or a fixed amount. It has dates, a minimum purchase, a limit in total and per student, and can be limited to chosen students. It is checked when previewed and again when bought, recorded on use, and never takes a price below zero.
• Bundles bought wholeAn admin builds a bundle from one teacher’s courses with a percentage or a fixed discount and optional dates, and its total is kept after the discount. Buying it checks that it is active and in date, refuses it if the student already holds every course, checks the wallet, and makes one order for each course.
• Paid and solved examsAn exam is a test, a homework or a listening exercise, in a set or a random order, free or with a price and a discount. A solved exam is a video course of its own type that explains one, and a paid exam must be linked to one. Access to an exam is an order.
• The order of studyA course opens only when the teacher’s earlier courses are finished; the first is always open, and a bundle’s courses open on purchase. Inside a lesson the order is homework, then the video, then listening. A locked page says what to finish first.
• A wrong-answers limitA teacher sets a limit on an exam. On submitting, if the wrong answers reach it (an essay counts as wrong) and the exam has a solved course, the student is sent to that course with a message, and the result page offers the full solution.

During 2025 the platform gained exam, homework and listening tools, storage for video and files, comments, live meetings and, in December, one price engine with coupons, bundles, paid and solved exams, an unlock order and a wrong-answers limit. The original code base and its earlier years are not ours, and this page describes only what we added.