awesome-billing

The 2 critical metrics being Customer Acquisition Cost (CAC) and Customer Lifetime Value (CLV).

“Data Engineers build data pipelines and infrastructure to ensure a constant availability of transformed data. Data Scientists analyze and build models from these data to develop new product features or drive the bottom line of the business.” As for AI professionals, their focus is on cognitive automation.

Great breakdown of Visa business models and metrics.

🆓 Enterprise-ready business intelligence web application, governed by the Apache Software Foundation.

Metrics produced above have a greater reach, as they're used as important signals to validate product-market fit.

“Data science is best viewed as a form of company culture, rather than a set of technologies. However, many firms will try to create that company culture by acquiring data-science technology, rather than working on their culture.”

“Which comes first, the supply or the demand? Chicken or egg?”

A bit of vocabulary: “In a casino, the term

This paper describes the pricing strategy model deployed at Airbnb.

“Cloud providers possessing large quantities of spare capacity must either incentivize clients to purchase it or suffer losses. Amazon is the first cloud provider to address this challenge, by allowing clients to bid on spare capacity and by granting resources to bidders while their bids exceed a periodically changing spot price.”

“Amazon's spot price is unlikely to be set according to market supply and demand. Rather, price oscillates within a very narrow band most of the time, which is more likely to be an artifact of some pricing algorithm with predetermined reserve price.”

A list of test cases for developers to test their tax code against.

European Union reference on the common system of VAT.

🆓 Centralize applicable VAT rates on foreign online services, for each country of residence (including territorial exceptions).

List of countries requiring application of taxes on foreign provided online services.

“If you think you can just setup a simple Stripe integration and move on, like us, you'd be sadly mistaken.”

A huge collection of everything that went wrong, and still is, with payment APIs from the past 2 decades. Any issue exposed in this article that gets unaddressed will end up as stolen money.

A system checking the matching of customer's billing addresses with the one associated with the credit card.

Collection of miscellaneous notes primarily focused on the common cases of routable accounts, i.e. checking and savings.

RDBMS were build for banks around transactions to solve that specific issue. Then NoSQL came forcing us to carefully implement systems to avoid double spending.

EU standard for QR codes used to transfer money between bank accounts via SEPA.

European rules on applicable fees for late payments.

A great introduction on all the various aspects of a billing system, from currency to invoices, including great illustrations on the logic of changing plans. All these topics are detailed in dedicated sections below.

Describes how to view accounting in the form of graphs in which money flows, then how these movements are materialized in the financial statements of a small company.

A general introduction to history and vocabulary of accounting.

An interactive form to play with accounting concepts.

Explain the basic data model of a double-entry accounting system relying on Google Spanner for internal use at Square.

🆓 Core functionality of a double entry accounting system for Django, single-maintainer MIT library.

💸 MIT-licensed programmable double-entry ledger with the Numscript DSL, multi-currency, REST API, and Docker deployment usable standalone. Formance sells Enterprise add-ons (Wallets, Flows, Reconciliation, pre-built connectors, SSO, RBAC, audit logs) on top, but the core ledger is fully functional in OSS.

Helps you learn how to analyse and monitor your company's financial performance.

Advanced abstract algebra applied to the analysis of accounting systems.

Allows you to fully understand how to use financial data to make better decisions for your business.

Implementing usage-based pricing is tricky, and this algebra will help you organize temporal reasoning. Also see this

“The strategy of improving user service quality is discussed first, followed by the pricing strategy for cloud resources to maximize revenue.”

An example of really tricky burstable instances which accrues and limits its own amount of CPU usage credits.

38 models for inspiration.

A list of 15 different ways to sell products and services.

🆓 An open-source, fast (50k+ CPS) and scalable (load-balancer + replication included) real-time billing for ISPs and Telecom Operators, written in Go. Vendor-neutral, support-only commercial model.