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Hello everyone, konnichiwa. My name is Thiago Scalone, and I am a software engineer from Brazil. I'm excited to talk about our case involving 20,000 mRuby terminals in production.
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Firstly, I want to share some common misunderstandings about Brazilians. We do not speak Spanish. Portuguese is the language we speak. Not everyone in Brazil is a soccer fan, and while some people enjoy hugs and physical contact, others may appreciate personal space. As Brazilians, we love to party and enjoy drinks; we work hard, but we know how to have fun too. We work diligently for everything we achieve.
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Now, let’s discuss called walk. This is a payment processor that plays a critical role in the infrastructure of payment transactions. The typical transaction flow starts with the issuer, usually a bank, which supplies a credit card to the cardholder. The cardholder can then use this card at various places to purchase goods or services. In Brazil, our largest challenge is that many acquirers are inefficient, often requiring extensive personnel to accomplish basic tasks. Many also rely on outdated technology that is difficult to maintain, leaving them ill-equipped to offer modern digital products.
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Calling upon better solutions, we established our approach at called walk, which sets us apart from other players in the field. We implemented it as an entry point for payments, allowing flexibility in managing transactions. We can convert transactions into token receipts while adjusting the entire payment flow to apply blockchain technology to enhance security against fraud and ensure settlement.
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Next, I will delve into mRuby and its capabilities. We are developing an open ecosystem that utilizes Ruby to deliver applications. Anyone interested in creating digital transactions, cashbacks, or any payment types can create their applications using mRuby and deploy them on the terminals. Let's dive into a simple demo application that illustrates the next steps.
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In this demo, I will be showing you how to update the runtime, configure communications, leverage transaction security with cryptography, share code between CRuby and mRuby, manage concurrency, and handle memory management effectively. At the end of the session, I will also show you a video of a real transaction using two devices in our production environment.
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To start this demo, we will call our CLI.
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Using the mRuby CLI, we will create a simple application called 'walk new ruby tiny.' The project structure will be shown in our back-end system and can be compiled when deployed. In this demonstration, I will talk about the mRuby test.
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The essential workflow for creating a solution comprises compiling code and deploying it to the machines. If you are looking to create a payment solution for any application, this is how you can deliver it. Now, I want to explain the critical parts involved in running mRuby and how they connect.
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The mRuby CLI enables project creation, compilation, and deployment. We have multiple major solutions working to enable this functionality, including the mRuby CLI framework altered for IoT use. This small environment accommodates cross-compilation, modular development, and simplified executions without needing complex setups.
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Furthermore, we've established a framework for managing hardware interfaces and implementing compilation packaging tools, making them beneficial to our development workflow. Among the features we focus on are displaying images, generating QR codes, and managing device interactions, all of which are essential for the IoT space.
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Now let's address how hardware communication occurs. Our terminals primarily use GPRS, 3G, or Wi-Fi connections to facilitate transactions. Persistent TCP socket connections play a vital role in ensuring smooth operations, especially as we implement TLS protocols to bolster security. Our goal is to minimize the drawbacks associated with frequent handshakes and negotiations that can delay transactional efficiency.
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Using WebSockets as a binary protocol, we've further enhanced our communications systems. Developed as part of the overall architecture, it enables simultaneous notifications for multiple devices, ensuring timely updates on transactions and events like transaction confirmations.
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For secure transactions, we have adopted ISO 8583 as a payment industry standard. This process is quite complex and challenging to implement successfully across various systems. It requires efficient data handling since the terminals operate with limited memory, often around 2 megabytes a month. Given these constraints, we prefer using lightweight protocols and binary exchanges to optimize performance.
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Ruby enhances our capabilities significantly. Historically, many features required development directly in C, but now with Ruby running on our terminal, we can maintain simpler interfaces and manage connections more effectively. With the enhanced capabilities of mRuby, communication management has become more streamlined, allowing terminals to switch seamlessly between Wi-Fi and GPRS as necessary.
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Another vital aspect is ensuring security compliance, particularly regarding transactions processed through PCI PTS terminals. We have established robust security measures, including utilizing libraries for encryption, secure transactions, and standardizing interfaces all managed efficiently through mRuby.
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We also emphasize the importance of sharing code between our servers and terminals. Using libraries like Bundler simplifies this process, improving efficiency and opening up possibilities for various application developments across our environment.
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In conclusion, we’ve been running more than 40,000 terminals in production, handling over 1 billion dollars in payments this year. Approximately 50% of our total transaction volume is managed through mRuby, showing great success and reliability in performance. Thank you for your attention, and I am happy to answer questions.