Test Technique - Laravel Wallet

Requirements

• PHP 8.2+
• Composer

(i) No need database, just use sqlite.

Installation

composer install

php artisan key:generate

php artisan migrate:fresh --seed

npm install

npm run dev

php artisan serve

Running tests

vendor/bin/pest

Running formatter

vendor/bin/pint

Default Users

Rich chill guy (1M€ balance):

• Email: [email protected]
• Password: password

Another guy (0€ balance):

• Email: [email protected]
• Password: password

Database schema

Amounts are saved in cents.

Some Laravel tables are included :

• sessions
• cache
• cache_locks
• jobs
• job_batches
• failed_jobs

Tickets

⚠️ Tests, factories & seeders are mandatory/required

Bugfix - Error on login

On first login after registering, this error is thrown:

Call to a member function transactions() on null

Feature - Notification when balance is low

When a user balance is low (< 10€), he should be notified by email.

Feature - Recurring transfers

As a user, I want to be able to create recurring transfers.

I want to define :

• A start date
• An end date
• A frequency in days
• An recipient email
• An amount
• A reason

Of course, I want to be able to delete a recurring transfer.

The transfer must be executed every X days (according to the periodicity defined by the user) at 2:00 a.m. The transfer must also be executed immediately after its creation.

If the user has a balance lower than the amount, the transfer should fail and the user should be notified by email.

• A POST api endpoint to create recurring transfer
• A DELETE api endpoint to delete recurring transfer
• A GET api endpoint to list recurring transfer (with their status)
• Any kind of UI in the dashboard

BONUS - Feature - Taking out a loan

As a user I can ask to take out a loan.

The credit is granted automatically if the following conditions are met:

0-200 € :

• If, over a 3-month period, the average account balance was above €100.

200-500 € :

• If, over a 3-month period, the average account balance was over €300;
• and the user has made at least 5 transfers over the same period.

500-1000 € :

• If over a 3-month period, the average account balance was above €500;
• and the user has made at least 1 transfer representing at least 50% of this average balance over the last six months.

Once the credit has been taken out, a recurring transfer (spread over 3 months) which the user cannot delete must be created, with a periodicity of 30 days.

BONUS - Question

How can you ensure that recurring transfers are executed in the most optimal order?

In particular, when a user has several recurring transfers to be executed on the same day?

Example: at 2:00 AM my wallet is empty (0€), a debit (50€) is scheduled and an automatic transfer of 75€ from another user is also scheduled to be credited to the account.

How would you ensure that as many transactions as possible are successful?