Textbook in PDF format

Learn how to build reliable software that deals with payments, money, numbers, transactions, webhooks, dashboards, and exports.
"Building Finance Apps with Laravel" is a 90-page guide that teaches you how to build reliable software that deals with money.
In this book, I'd like to show you some ideas and tips that you can use in any financial-related applications of features. We're going to rebuild some features of Paddle. Paddle is a finance application.
This is what's happening:
A seller (or content creator) uploads a product to Paddle
They integrate Paddle into their landing page
Buyers buy the product from the landing page using a Paddle checkout form
Paddle pays the seller every month
I personally use Paddle to sell my books and SaaS and it's a great service. The main benefit is that you don't have to deal with hundreds or thousands of invoices and VAT ramifications. Paddle handles it for you. They send an invoice to the buyer and apply the right amount of VAT based on the buyer's location. They also handle VAT ramifications. You, as the seller, don't have to deal with any of that stuff. They just send you the money once every month and you have only one invoice. It also provides nice dashboards and reports. In this short book, I'd like to rebuild some of its core features. My experience is that there are lots of (mostly) legacy projects where dealing with money, numbers, and payments is implemented in a horrible way.
Value objects
Working with money
Working with percentages
Handling dates
Sending payouts via Stripe
Building dashboards
Exporting large numbers of data
Working with queues and workers
Triggering webhooks
Handling transactions
Basic performance optimizations