Payments

Introduction If you send or receive money within Europe, chances are you already use SEPA transfers—often without realizing it. SEPA (Single Euro Payments Area) made euro payments across participating countries as simple as domestic transfers: fast, inexpensive, and standardized. Yet, beneath that simplicity lies a well-defined set of schemes, rules, message formats, timelines, and compliance requirements that matter to consumers, businesses, and developers alike. This guide provides a detailed overview of SEPA transfers, including how they work, the differences between standard and instant SEPA payments, the file and API standards (ISO 20022), fees and timelines, compliance considerations, and practical code examples for validation and payment initiation. ...

Introduction Bitcoin apps have evolved far beyond simple send-and-receive wallets. Today’s ecosystem includes secure self-custody wallets, Lightning Network payment apps, merchant point-of-sale systems, full nodes and infrastructure tools, privacy and multisig coordinators, tax and portfolio software, and developer SDKs. This guide provides a comprehensive, practical overview to help you choose, set up, and safely use Bitcoin apps depending on your goals—whether you’re a newcomer, a merchant, a power user, or a developer. ...

Introduction Building a SaaS today means delivering a seamless experience across platforms, iterating quickly, and instrumenting everything from auth to analytics. Expo—on top of React Native—gives you a modern toolchain to ship high-quality mobile (and web) apps faster, with over-the-air updates, a file-based router, first-class TypeScript, deep integrations, and a sane path to the App Store and Google Play. In this guide, you’ll go from zero to hero building a production-ready SaaS with Expo. We’ll cover architecture, auth, multi-tenancy, payments (Stripe and RevenueCat), deep linking, push notifications, OTA updates with EAS, testing, security, analytics, and CI/CD. You’ll get practical code snippets and a curated resources section for deeper research. ...

Table of Contents Introduction: Why Stripe for Your SaaS Core Concepts: Understanding Payment Processing Setup: Getting Started One-Time Payments: The Foundation Subscriptions: The SaaS Backbone Webhooks: Listening to Stripe Events Customer Management: Building Relationships Security: Protecting Your Business Testing: Getting It Right Production Checklist: Going Live Resources: Your Arsenal Introduction: Why Stripe for Your SaaS Stripe is the payment infrastructure that powers millions of businesses worldwide. For SaaS founders, it’s the gold standard because: ...