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EMV Made Simple: What It Is and Why It Matters
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This post is the starting point of a full-blown series consisting of around 45 blog posts that will explore the entire EMV payment ecosystem from the fundamentals to advanced cryptographic operations, issuer scripts, and even certification. If you’ve been meaning to truly understand EMV, you’re in the right place. This is not a one-off explainer…
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Understanding Data Types in ISO 8583
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Back when I was working on a host emulator project for issuer and acquirer simulations, one of the tricky areas I faced early on was understanding how the data elements in ISO 8583 are formatted. It wasn’t just about packing and unpacking the messages, the real challenge was knowing how to interpret the field types…
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Decoding ISO 8583: Understanding HEX, Decimal, Binary, and ASCII Formats
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Hello everyone! In this post, I want to share something that recently became a big part of one of my projects, decoding and understanding different encoding formats used in ISO 8583 messages. If you have worked with payment switching, host simulations, or POS terminal development, you know how important it is to be comfortable with…
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Breaking Down ISO 8583 Data Elements
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In my previous blog post, I already discussed a high-level overview of ISO 8583 Data Elements. If you haven’t read it yet, I highly recommend checking it out first, as this current post will build on some of those concepts without going into the same level of detail—to keep this article focused and concise. Understanding…
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High-Risk Merchants and Rolling Reserves: Everything You Need to Know
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If you’ve been navigating the world of payment processing, you’ve probably heard the terms “high-risk merchant” and “rolling reserves” thrown around a lot. It can be a bit overwhelming to figure out what these mean and how they affect your business. Don’t worry, I’ve been there too, and I’m here to break it down for…
About Me
Hi I’m Assi—I’m dedicated to advancing cashless payment technology and sharing insights with fellow developers and solution architects on my blog, Cashless Nomad.
I embrace a mobile lifestyle by replacing cash with digital payments, enabling seamless transactions anywhere. Going cashless keeps me connected, agile, and financially flexible—perfect for traveling light and skipping currency hassles.
Checkout my other blogs at marai.dev